JP2002047498A - High sulfur engine oil composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high sulfur engine oil composition that can afford a constant concentration of sulfur in an exhausted gas and that does not adversely affect cleanability in an internal combustion engine, wear of a bearing material made of a copper-base material and deterioration of an engine oil, or the like. SOLUTION: The high sulfur engine oil composition comprises a base oil composed of a mixed oil containing an extract produced from a solvent refining unit in the refining process of a lubricating oil and/or a raffinate produced from a contact dewaxing unit, and preferably containing a mineral oil and/or a synthetic oil, and has a sulfur content of not less than 1 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-sulfur engine oil composition, and more particularly to a high-sulfur engine oil composition suitably used in an engine oil consumption measurement system by tracking sulfur in exhaust gas.

[0002]

2. Description of the Related Art In order to monitor the oil consumption of an engine, there is a method of measuring the concentration of sulfur such as sulfur dioxide in exhaust gas using a sulfur tracer meter. If a fuel containing no sulfur is used, all of the sulfur detected from the exhaust gas will be attributable to the engine oil, and by tracking the sulfur in the exhaust gas, it will be obvious that at constant speeds, The consumption can be measured. Conventional high-sulfur engine oils include an additive component containing a sulfur component, for example, a zinc dialkyldithiophosphate (hereinafter, referred to as “ZDTP”), an increased amount of addition, a sulfur-based additive such as polysulfide, Dibenzyl disulfide (hereinafter referred to as “dibenzyl disulfide”), which is often used for adjusting sulfur concentration in fuel,
It is called “DBDS”. ) Was added.

[0003]

In order to improve the accuracy of the sulfur tracer meter, the sulfur concentration in the oil pan oil must be high, the sulfur concentration in the consumed engine oil must be constant, and the engine must be clean. It is desired not to adversely affect the properties, wear, oil deterioration, and the like. However, when an engine oil composition in which the sulfur content is increased by a conventional additive is used, the concentration of sulfur contained in the exhaust gas is not constant, and the accuracy of the oil consumption measurement value is not only poor, but also long. The use of time adversely affects the cleanliness of the engine, the wear of the bearing material made of a copper-based material, the deterioration of oil, and the like. Accordingly, the present invention has been made in view of such circumstances, and its purpose is to reduce the sulfur concentration in exhaust gas, and to improve the cleanliness of the engine, wear of bearing materials of copper-based materials, oil deterioration, etc. An object of the present invention is to provide a high-sulfur engine oil composition having no adverse effect.

[0004]

Means for Solving the Problems As a result of repeated studies to solve the above problems, the present inventors have found that a specific engine oil composition has a constant sulfur content during operation of the engine. In addition, they have found that the accuracy of the sulfur tracer meter can be improved without adversely affecting the cleanliness of the engine, the wear of the bearing material of the copper-based material, the oil deterioration, and the like, and have completed the present invention. That is, the high-sulfur engine oil composition of the present invention is based on a mixed oil containing an extract obtained from a solvent refining device and / or a raffinate obtained from a catalytic dewaxing device in a lubricating oil refining step, and The composition has a sulfur content of 1% by mass or more.
It is preferable that the extract is obtained by a solvent refining apparatus using furfural as a solvent.
Further, the mixed oil as the base oil is composed of a mineral oil and / or a synthetic oil having a sulfur content of less than 1% by mass, based on the total amount of the base oil, from 10% by mass to 90% by mass.
It is preferable that the content is contained by mass%. The mineral oil and the synthetic oil preferably have a viscosity index of 120 or more. Preferably, these high sulfur engine oil compositions are for measuring oil consumption. The sulfur content in the present invention means a value measured according to "6. Radiation excitation method" of JIS K 2541-1996 "Crude oil and petroleum products-Sulfur content test method".

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the contents of the present invention will be described in more detail. The base oil in the high sulfur engine oil composition of the present invention is a mixed oil containing an extract obtained from a solvent refining device in a lubricating oil refining step and / or a raffinate obtained from a catalytic dewaxing device. Generally, the solvent refined base oil among the high-grade lubricating base oils is usually appropriately combined with a vacuum distillation unit, a propane desorption unit, a solvent purification unit, a hydrorefining unit, a MEK (methyl ethyl ketone) dewaxing unit, and a contact dewaxing unit. The extract obtained from the solvent refining device in the base oil of the engine oil composition of the present invention is the product extracted from the bottom of the solvent refining device in the lubricating oil refining step through a decompression or heating device. The remaining lubricating oil fraction from which the solvent was recovered is shown. As the solvent used in the solvent refining apparatus, furfural, phenol, N-methylpyrrolidone (NMP),
Cresol, sulfolane, dimethyl sulfoxide,
Formyl morpholine, glycol-based solvents and the like are used, and furfural and N-methylpyrrolidone are preferred.
Furfural is particularly preferred. Further, the raffinate obtained from the catalytic dewaxing device in the engine oil composition of the present invention refers to a lubricating oil fraction from which wax has been removed by the catalytic dewaxing device in the lubricating oil refining step. In the present invention, the extract obtained from the solvent refining device and / or the raffinate obtained from the catalytic dewaxing device in the lubricating oil refining step means a lubricating oil fraction as described above. The treatment and post-treatment steps are not particularly limited. If necessary, the oxidation stability can be improved by hydrogenation treatment, terra alba treatment, catalytic reforming, or the like. Modified lubricating oils are also included.

[0006] The lower limit of the sulfur content of the extract obtained from the solvent refining device and the raffinate obtained from the catalytic dewaxing device in the engine oil composition of the present invention is as follows:
Although not particularly limited, it is preferably 1% by mass, more preferably 2% by mass, and particularly preferably 3% by mass. When the sulfur content of the extract and the raffinate is less than 1% by mass, the accuracy of measuring the sulfur content in the exhaust gas may be reduced when the extract and the raffinate are used in an oil consumption measurement system. On the other hand, the upper limit of these sulfur contents is not particularly limited, but is preferably 6% by mass, more preferably 5% by mass. If the upper limit of these sulfur contents exceeds 6% by mass, the heat and oxidation stability of the engine oil composition may decrease, and the viscosity index may decrease. The extract obtained from the solvent refining apparatus and the raffinate obtained from the catalytic dewaxing apparatus are used for the extraction.
The kinematic viscosity at ° C. is not particularly limited, and the lower limit is preferably 2 mm ² / s, more preferably 3 m ² / s.
m ² / s, while the upper limit is preferably 90 m
m ² / s, more preferably 40 mm ² / s. When the kinematic viscosity at 100 ° C. is less than 2 mm ² / s,
Lubricity may be poor, while the kinematic viscosity is 90 mm ² / s
If it exceeds 3, only a small amount can be blended in order to obtain an appropriate viscosity as an engine oil, and it may be difficult to make the sulfur content of the composition 1% by mass or more.

[0007] The base oil of the high sulfur engine oil composition of the present invention comprises an extract obtained from the solvent refining device and / or a raffinate obtained from the catalytic dewaxing device, and preferably a mineral oil usually used for lubricating oil. And / or a mixed oil arbitrarily combined with a synthetic oil. These mineral oils and synthetic oils preferably have a sulfur content of less than 1% by mass, more preferably less than 0.5% by mass, and still more preferably less than 0.0% by mass.
Less than 1% by mass is preferred. By using such a low-sulfur mineral oil and / or synthetic oil, the oxidative stability of the high-sulfur engine oil composition of the present invention can be further improved. These mineral oils and synthetic oils can be used alone,
A mixture of two or more mineral oils or two or more synthetic oils may be used, and a mixture of a mineral oil and a synthetic oil may be used.

[0008] As the mineral oil, specifically, for example, a lubricating oil fraction obtained by distilling a crude oil under normal pressure and reduced pressure is subjected to solvent removal, solvent extraction, hydrocracking, solvent removal, and contact removal. And mineral oil-based lubricating base oils such as paraffin-based and naphthenic-based oils, which are appropriately combined with purification treatments such as hydrorefining, sulfuric acid washing, and clay treatment. A particularly preferred example is a mineral oil having a high viscosity index, for example, a viscosity index of 120 or more, produced by advanced hydrocracking technology or wax isomerization technology.

Specific examples of synthetic oils include poly-α-olefins (polybutene, 1-octene oligomer, 1-decene oligomer, ethylene-propylene oligomer, etc.) and hydrides thereof, isobutene oligomers and hydrides thereof, Isoparaffin, alkylbenzene,
Alkylnaphthalene, diester (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, etc.), polyol ester (trimethylolpropane caprylate, trimethylolpropaneperalgonate, pentane) Erythritol 2-ethylhexanoate, pentaerythritol pelargonate), dialkyl diphenyl ether, polyphenyl ether and the like. In particular, a synthetic oil having a high viscosity index, for example, a viscosity index of 120 or more, such as a hydride of a poly-α-olefin such as a 1-decene oligomer, is preferable.

The kinematic viscosities of the above mineral oils and synthetic oils at 100 ° C. are not particularly limited, and any kinematic viscosities can be used. The lower limit of the kinematic viscosity at 100 ° C. is preferably 2 mm ² / s, more preferably. Is 3 mm ² / s, while its upper limit is preferably 40 mm ² / s, more preferably 20 mm ² / s. When the kinematic viscosity at 100 ° C. is less than 2 mm ² / s, lubricity may be poor. On the other hand, when the kinematic viscosity exceeds 40 mm ² / s, it may be adjusted to an appropriate viscosity as an engine oil composition. It may be difficult. The mineral oil and the synthetic oil may have any viscosity index, but preferably have a viscosity index of 120 or more. By using those having a viscosity index of 120 or more, a lubricating oil fraction having a viscosity index of −40 or less, such as an extract obtained from a solvent refining apparatus, is used as a single-grade oil engine oil composition having a viscosity index of 40 or more or Not only can a multi-grade engine oil composition having a viscosity index of 120 or more be obtained in combination with the addition of a viscosity index improver, but also an engine oil composition having excellent heat and oxidation stability can be obtained. On the other hand, the upper limit of the viscosity index is not particularly limited, but is generally about 200.

In the high sulfur engine oil composition of the present invention, it is necessary that the sulfur content based on the total amount of the engine oil composition is 1% by mass or more. When the sulfur content is less than 1% by mass based on the total amount of the engine oil composition, the accuracy of the measured value of the engine oil consumption by measuring the sulfur concentration contained in the exhaust gas is not preferable. The upper limit of the sulfur content is arbitrary, but is usually preferably 4% by mass or less, more preferably 3.5% by mass or less, based on the total amount of the engine oil composition. When an attempt is made to obtain an engine oil having a sulfur content exceeding 4% by mass based on the total amount of the engine oil composition, the blending ratio of the extract obtained from the solvent refining device and / or the raffinate obtained from the catalytic dewaxing device increases. In addition, the viscosity index of the engine oil may be lowered to deteriorate the viscosity characteristics, and the oxidation stability may be deteriorated. In addition, even if a large amount of the sulfur-containing additive is blended, the oxidation stability of the engine oil may be similarly deteriorated. The mixing ratio of the base oil in the engine oil of the present invention is arbitrary, and there is no particular limitation as long as the sulfur content of the engine oil composition can be adjusted to 1% by mass or more. An extract containing 1 to 6% by mass of sulfur obtained from the apparatus, preferably furfural extract (extract obtained by a solvent refining apparatus using furfural as a solvent) and / or a catalytic dewaxing apparatus 10 to 90% by mass of a raffinate containing 1 to 6% by mass of sulfur (based on the total amount of base oil);
A method using a mixed oil of 90 to 10% by mass (based on the total amount of the base oil) of a mineral oil of less than 1% by mass and / or a synthetic oil having a sulfur content of less than 1% by mass is exemplified. The blending ratio of the extract and / or the raffinate in the base oil is 10% by mass.
If it is lower than the above, it becomes difficult to adjust the sulfur content of the composition to 1% by mass or more even when the sulfur content from the additive which is usually essential is included. There is a concern that the measurement accuracy of the sulfur content may be reduced. Further, when the blending ratio of the extract and / or the raffinate in the base oil exceeds 90% by mass, the heat / oxidation stability and the viscosity-temperature characteristics of the engine oil composition may be deteriorated. In the high-sulfur engine oil composition of the present invention, the sulfur content of the base oil, which is a mixed oil, is based on the total amount of the composition, since the sulfur concentration in the exhaust gas can be kept constant.
It is preferably at least 0.7% by mass, more preferably at least 0.8% by mass, particularly preferably at least 1% by mass.

The engine oil composition of the present invention can prepare a single-grade engine oil having a viscosity index of 40 or more and a sulfur content of 1% by mass or more.
In order to prepare a single-grade engine oil, for example, the extract containing 1 to 6% by mass of sulfur and / or 30 to 70% by mass of the raffinate containing 1 to 6% by mass of sulfur (base oil total amount) Standard) and a mineral oil having a sulfur content of less than 1% by mass and / or a synthetic oil having a sulfur content of less than 1% by mass
It is preferable to use a mixed oil of 30% by mass (based on the total amount of the base oil) as the base oil. In particular, the sulfur content is 3 to 6% by mass,
Furfural extract having a kinematic viscosity at 3 ° C. of 3 to 40 mm ² / s has a sulfur content of less than 0.01% by mass, a kinematic viscosity at 100 ° C. of 3 to 8 mm ² / s and a viscosity index of 120 or more. It is preferable to use a base oil obtained by mixing a chemically refined mineral oil and / or a hydrocracked mineral oil. With such a composition, 10 W, 20, 30, 40, 50, 60 specified in the viscosity classification of SAE J300.
It is possible to adjust single grade engine oils such as.

Further, the engine oil composition of the present invention can prepare a multigrade engine oil having a viscosity index of 120 or more and a sulfur content of 1% by mass or more.
In order to prepare a multi-grade engine oil, 20 to 50% by mass of an extract obtained from a solvent refining device and / or 20 to 50% by mass of a raffinate obtained from a catalytic dewaxing device containing 1 to 6% by mass of sulfur and 1 It is preferred that the base oil be a mixed oil with less than 80% by weight of mineral oil and / or 80 to 50% by weight of synthetic oil. In this case, the mineral oil and / or the synthetic oil having a sulfur content of less than 1% by mass preferably have a viscosity index of 120 or more. Furfural extract having a sulfur content of 3 to 6% by mass and a kinematic viscosity at 100 ° C of 3 to 40 mm ² / s has a sulfur content of less than 0.01% by mass and a kinematic viscosity at 100 ° C of 3 to 8 mm. ^Two
/ S, a base oil obtained by mixing a hydrorefined mineral oil and / or a hydrocracked mineral oil having a viscosity index of 120 or more, and a viscosity index improver is preferably blended. When the amount of the extract is less than 20% by mass, it is difficult to adjust the engine oil composition having a sulfur content of 1% by mass or more, and when the amount of the extract exceeds 50% by mass, even if a viscosity index improver is added. It is difficult to increase the viscosity index to 120 or more, and there is a possibility that the heat / oxidation stability is further deteriorated. The viscosity grade of the multi-grade engine oil is not particularly limited.
0W-20, 5W- specified in the viscosity classification of J300
It is also possible to prepare engine oil compositions of relatively low viscosity grade, such as 30, 10 W-30.

The high-sulfur engine oil composition of the present invention contains the above-mentioned extract, raffinate, mineral oil, synthetic oil or the like as a base oil and additives generally used for lubricating oils, for example, metal-based detergents. , Ashless dispersants, extreme pressure agents and antiwear agents, friction modifiers, viscosity index improvers, antioxidants, rust inhibitors, corrosion inhibitors, pour point depressants, rubber swelling agents, defoamers,
A coloring agent or the like can be added alone or in a combination of several types.

Examples of the metal-based detergent include sulfonates, phenates, and the like of alkali metals or alkaline earth metals.
Salicylate or any mixture thereof can be suitably used, and among alkaline earth metals, calcium and magnesium are preferable. The total base number is 0 to 500 mgKOH / g, preferably 0 to 400 mgKOH / g.
mgKOH / g can be appropriately selected, and can be mixed and used as needed. As the ashless dispersant, benzylamine, alkyl polyamine, alkenyl succinic ester, succinimide having an alkenyl group or an alkyl group, and the like can be used. An acid imide and / or a modified product thereof with a boron compound, an organic acid, or a sulfur compound can be preferably used. Here, the polybutenyl group refers to a polymer obtained by polymerizing a butene mixture or high-purity isobutene in the presence of an aluminum chloride or boron fluoride-based catalyst. As the extreme pressure agent and the wear inhibitor, for example, a sulfur compound, a phosphorus compound, an organometallic compound and the like can be used. Examples of the sulfur compound include disulfides, sulfurized olefins, sulfurized fats and oils, and sulfurized esters. Examples of the phosphorus compound include phosphoric acid monoesters, phosphate diesters, phosphate triesters, and phosphorous acid. Acid monoesters, phosphite diesters, phosphite triesters, salts of these esters with amines, alkanolamines and the like can be used. As organometallic compounds, zinc dithiophosphate and the like can be used.

As the friction modifier, for example, organic molybdenum compounds such as molybdenum dithiophosphate and molybdenum dithiocarbamate, aliphatic alcohols, fatty acids, fatty acid esters, aliphatic amines, aliphatic amine salts and aliphatic amides can be used. . Examples of the viscosity index improver include a dispersion type or non-dispersion type viscosity index improver, and examples thereof include a dispersion type or non-dispersion type polymethacrylate (PMA) and an ethylene-propylene copolymer (EPC).
Olefin copolymers such as polyisobutylene (PI
B), polystyrene, styrene-diene copolymer, styrene-diester copolymer (SDC), etc., and hydrides thereof can be used. Among the engine oil compositions of the present invention, the viscosity index of the composition is Formulated to obtain 120 or more multi-grade engine oils. As the antioxidant, any one commonly used in lubricating oils such as a phenolic compound and an amine compound can be used. For example, 2,6-di-tert-butyl- Alkylphenols such as 4-methylphenol, bisphenols such as methylene-4,4-bis (2,6-di-tert-butyl-4-methylphenol), naphthylamines such as phenyl-α-naphthylamine, and ester group-containing Phenols, dialkyldiphenylamines, phenothiazines, (3,5-di-tert-butyl-4-hydroxyphenyl) fatty acid (such as propionic acid) and a monohydric or polyhydric alcohol such as methanol, octadecanol, 1,6 Hexadiol, neopentyl glycol, thiodiethylene glycol, triethylene glycol Lumpur, esters of pentaerythritol and the like can be used.

As the rust inhibitor, for example, alkenyl succinic acid, alkenyl succinic ester, polyhydric alcohol ester, petroleum sulfonate, dinonyl naphthalene sulfonate and the like can be used. As the corrosion inhibitor, for example, benzotriazole, thiazole, thiadiazole, imidazole compounds and the like can be used.
As the pour point depressant, for example, a polymethacrylate-based polymer that is compatible with the lubricating base oil used can be used. As the defoaming agent, for example, silicone compounds such as dimethylsiloxane, phenylmethylsiloxane, and cyclic organosiloxane can be used. The addition amount of these additives is arbitrary, but usually the content of the antifoaming agent is 0.0005 to 0.01% by mass, and the content of the viscosity index improver is 0.01 based on the total amount of the engine oil composition. ~ 20% by mass,
The content of the corrosion inhibitor is 0.005 to 0.2% by mass, and the content of other additives is about 0.005 to 10% by mass, respectively.

[0018]

EXAMPLES Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these contents.

High sulfur engine oil compositions according to the present invention having the compositions shown in Examples 1 to 4 in Table 1 were prepared. The following tests were performed on these compositions.

[0020]

[Table 1]

(Distillation Characteristics) Distillation properties of the composition of Example 1 and a commonly used CF grade SAE30 oil were examined, and the results are shown in FIG. The distillation properties were determined according to ASTM D2.
It was measured according to the gas chromatography distillation test specified in 887. As is clear from the results shown in FIG. 1, it was confirmed that the composition of Example 1 and the CF-grade SAE30 oil exhibited almost the same distillation characteristics in a distillation property range of about 30% by volume or less, which affects oil consumption. Was done.

(Sulfur distribution ratio) For the compositions of Examples 1 to 4, 10 to 20% by volume and 20 to 4
A fraction of 0% by volume was collected, and the ratio of sulfur distribution in the distillation fraction was determined, and the results are shown in Table 2. As is clear from the results shown in Table 2, the high-sulfur engine oil compositions of the present invention all have a sulfur content of 1% by mass or more and a sulfur content of up to 40% by volume of a distillate fraction that affects oil consumption. Since the distribution shows a uniform value, it can be seen that the engine oil composition is optimal for the oil consumption measurement system.

[0023]

[Table 2]

(Oxidation Stability) The composition of Example 1 was subjected to an oxidation stability test in accordance with JIS K 2514 (lubricating oil oxidation stability test method (ISOT)), and the results are shown in Table 3. . Further, as Comparative Example 1, a commercial CF grade oil comprising the same CF class additive as in Example 1, and as Comparative Example 2, a sulfur content of the commercial CF grade oil of Comparative Example 1 was the same as in Example 1. The oxidation stability of the test oil to which zinc dialkyldithiophosphate was additionally added was examined in the same manner, and the results are shown in Table 3. As is clear from the results shown in Table 3, the high-sulfur engine oil composition of the present invention according to Example 1 has a small increase in viscosity and a small increase in total acid value, and has the same engine oil performance as the commercial CF class oil of Comparative Example 1. On the other hand, in Comparative Example 2, the test was interrupted 4 hours after the start of the test because of the strong smell of hydrogen sulfide generated by the decomposition of the zinc dialkyldithiophosphate. That is, the composition of Comparative Example 1 is not suitable as an engine oil composition. Comparative Example 1
Has a sulfur content of less than 1% by mass, and is unsuitable for the accuracy of a sulfur tracer meter for use in the oil consumption measurement system of the present invention.

[0025]

[Table 3]

(Evaporation) The evaporation loss of the compositions of Examples 2 to 4 was measured in accordance with the NOACK evaporation test method, and the results are shown in Table 4. For comparison, zinc dialkyldithiophosphate was added as a sulfur base to a commercially available SJ-class 10W-30 oil so that the sulfur content was the same as in Example 2, and the sulfur concentration in the composition was set to 2.
For Comparative Example 3 adjusted to 15% by mass, the evaporation loss mass was measured in the same manner, and the results are shown in Table 4. From the results shown in Table 4, by adjusting the mixing ratio of a high sulfur base material represented by furfural extract constituting the present invention and a solvent refined mineral oil or a hydrocracked mineral oil, the NOACK evaporation amount can be relatively freely controlled. It can be adjusted. Therefore, the present invention is also suitable for the purpose of investigating the effect of NOACK evaporation of engine oil on oil consumption. On the other hand, in Comparative Example 3, although the amount of zinc dialkyldithiophosphate added was equivalent to 10 times the amount of ordinary engine oil, the oil in the container was solidified due to the thermal decomposition of the zinc dialkyldithiophosphate, and the measurement was performed. Became impossible. That is, it can be said that the composition of Comparative Example 3 is unsuitable as an engine oil.

[0027]

[Table 4]

(Low-temperature performance) The compositions of Examples 2 and 3 were subjected to a low-temperature performance test, and the results are shown in Table 5. For comparison, Comparative Example 4 using an untreated lubricating oil fraction obtained from a vacuum distillation apparatus and not subjected to a refining step as a high-sulfur lubricating oil fraction instead of the extract and the raffinate was used. A low-temperature performance test was also performed on Comparative Example 5 using a raffinate obtained from a solvent or a solvent refining apparatus, and the results are shown in Table 5. As is clear from the results shown in Table 5, the high sulfur engine oil compositions of the present invention according to Examples 2 and 3 are all excellent in low-temperature performance.
On the other hand, in Comparative Example 4, the low-temperature fluidity was inferior, the pour point was increased, and a multi-grade engine oil could not be produced. Further, in Comparative Example 5, not only is the low-temperature fluidity inferior because it contains a large amount of wax, but also the sulfur concentration is usually about 0.7% by mass,
In order to make the sulfur content of the composition 1% by mass or more, it is necessary to add a large amount of the above-mentioned additive such as zinc dialkyldithiophosphate, so that the above-mentioned problem may occur.

[0029]

[Table 5]

[0030]

As described above, the high-sulfur engine oil composition of the present invention has a constant sulfur content during operation of the engine and has an adverse effect on the cleanliness, wear and oil deterioration of the engine. Without affecting the accuracy of the sulfur tracer meter.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a temperature and a distillation ratio.

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Claims (5)

[Claims] 1. A mixed oil containing an extract obtained from a solvent refining device and / or a raffinate obtained from a catalytic dewaxing device in a lubricating oil refining step is used as a base oil, and the composition has a sulfur content of 1% by mass. % High sulfur engine oil composition. 2. The high sulfur engine oil composition according to claim 1, wherein the extract is obtained by a solvent refining apparatus using furfural as a solvent. 3. The mixed oil as a base oil contains 10% to 90% by mass of a mineral oil and / or a synthetic oil having a sulfur content of less than 1% by mass, based on the total amount of the base oil. Or 2
2. A high sulfur engine oil composition according to item 1. 4. The high sulfur engine oil composition according to claim 3, wherein the mineral oil and the synthetic oil have a viscosity index of 120 or more. 5. A high sulfur engine oil composition according to claim 1, wherein the high sulfur engine oil composition is used for measuring oil consumption.