JP2000192069A - Lubricating oil composition and additive composition for diesel internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating oil composition which has such thermal oxidation stabilty and high-temperature cleanliness as to be enough under the severe operation conditions of diesel engines for today's ships and on-land power generation and which exhibits an excellent lubricity even under severe friction conditions. SOLUTION: This composition is prepared by dissolving or dispersing 1.0-20.0 wt.% overbasic alkyloxybenzenesulfonate detergent, 1.0-20.0 wt.% neutral or basic salicylate detergent, 0.1-10.0 wt.% ashless dispersant, 0.1-2.0 wt.% zinc dialkyldithiophosphate, and 0.05-2.0 wt.% nonmetallic antioxidant in a base oil having a kinematic viscosity (at 40 deg.C) of 22-300 mm2/s.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil composition suitable for lubricating a diesel internal combustion engine for power generation installed on land or a diesel internal combustion engine for ship operation installed on a ship, and the preparation of the lubricating oil composition. The present invention relates to an additive composition which is advantageously used for the present invention.

[0002]

2. Description of the Related Art A diesel engine has been generally used as an internal combustion engine for power generation installed on land or an internal combustion engine for ship operation installed on a ship. The use of lubricating oil is essential for the smooth operation of internal combustion engines such as diesel engines and gasoline engines, and various types of lubricating oils are used depending on the type of internal combustion engine and operating conditions. Recently used lubricating oils contain various additives for improving the performance of the lubricating oil itself and enhancing the durability of the lubricating oil.

A typical composition for lubricating oil for diesel engines installed on ships is a lubricating base oil containing a metal-containing detergent such as calcium sulfonate, calcium phenate, calcium naphthenate or calcium salicylate, and A composition in which an ashless dispersant or an antioxidant is dispersed or dissolved. In other words, the main fuel of the conventional marine diesel engine is a petroleum fuel containing a large amount of sulfur components such as heavy fuel oil A or heavy fuel oil C, and its combustion produces a large amount of acidic sulfur oxides. An intended overbased metal-containing detergent is blended.
This metal-containing detergent, along with neutralization of sulfur oxides, uniformly disperses combustion residues called soot and sludge into the lubricating oil, which are mixed into the lubricating oil as the operation of the engine progresses. This prevents the combustion residue from accumulating on components inside the engine such as the piston and the engine inner wall. Antioxidants also serve to prevent thermal oxidation degradation of lubricating oils that are exposed to high temperatures during operation of the engine.

[0004] In recent years, it has become common for diesel engines to be installed on land and used for power generation.
This onshore power generation diesel engine employs the same fuel and operating conditions as the marine diesel engine.

[0005] In recent years, the operating conditions of diesel engines for land-based power generation and marine diesel engines have tended to become more severe, and the fuels used have also tended to use lower-grade fuels with further increased sulfur content. In particular, in the case of diesel engines for land-based power generation, the timing of replacing the lubricating oil has been prolonged due to economical efficiency and efficient management of mechanical maintenance, and the load on the lubricating oil has been increasing. That is, lubricating oil is consumed as the operation of the engine progresses, so lubricating oil is regularly replenished.However, since the lubricating oil in the engine is mixed with sulfur oxides and combustion residues and accumulates, When the operation of the engine is continuously performed for a long period of time, the deterioration of the lubricating oil and the increase in the viscosity become severe.

Japanese Unexamined Patent Publication No. 9-511015 discloses an overbased alkyloxybenzene sulfonate as a novel metal-containing detergent having high cleanliness and which can be produced economically. An example of the additive composition of a lubricating oil composition for a marine diesel engine using a basic alkyloxybenzene sulfonate is shown. Examples of the composition of the lubricating oil composition for a marine diesel engine include a composition obtained by blending zinc dialkyldithiophosphate (Zn-DTP) with an overbased alkyloxybenzene sulfonate (eg, overbased phenoxysulfonate). Phenoxysulfonate with alkenyl succinimide ashless dispersant, overbased phenoxysulfonate with Zn-DTP and ashless dispersant, overbased phenoxysulfonate with phenolic antioxidant or alkylated diphenylamine antioxidant A composition in which a non-metallic antioxidant such as an agent is blended, a composition in which Zn-DTP and a non-metallic antioxidant are blended in overbased phenoxysulfonate, an ashless dispersant and Zn- With DTP and / or non-metallic antioxidants Compounded composition, overbased phenoxysulfonate, overbased sulfurized alkyl phenate or overbased sulfurized alkyl salicylate, overbased phenoxysulfonate, overbased sulfonate and Zn-DTP A composition in which an overbased sulfurized phenate and an ashless dispersant are blended with an overbased phenoxysulfonate, a composition in which an overbased sulfurized phenate, an ashless dispersant, and Zn-DTP are blended with an overbased phenoxysulfonate, Basic phenoxy sulfonate, overbased sulfurized alkyl phenate, Zn
Numerous examples of lubricating oil additive compositions are provided, such as compositions incorporating DTP, ashless dispersants, and non-metallic antioxidants.

[0007]

[Problems to be Solved by the Invention]
The additive composition for lubricating oil for marine diesel engines obtained by blending various additives with the overbased alkyloxybenzene sulfonate described in JP-A No. 5 is effective for improving lubricating oil properties such as cleanliness, and The economy is excellent,
To meet the demanding operating conditions of modern marine and onshore diesel engines is not always satisfactory.

Accordingly, it is an object of the present invention to exhibit thermo-oxidative stability and high temperature cleanliness that is well suited to the severe operating conditions of modern marine and onshore power generation diesel engines, and to provide superior thermal friction conditions. An object of the present invention is to provide a lubricating oil composition exhibiting lubricity. Another object of the present invention is to provide an additive composition that can be advantageously used in producing the above lubricating oil composition.

[0009]

According to the present invention, a kinematic viscosity at 40 ° C. is from 22 to 300 mm ² / s (preferably from 22 to 300 mm ² / s).
A lubricating oil composition for a diesel internal combustion engine, characterized in that at least the following components are dissolved or dispersed in a base oil of 40 mm ² / s). (1) The overbased alkyloxybenzene sulfonate detergent contains 1.0 to 20.0% by weight (preferably 2.0 to
(2) Neutral or basic salicylate detergent.
0 to 20.0% by weight (preferably 1.0 to 10.0% by weight); (3) 0.1 to 10.0% by weight of ashless dispersant (preferably 0.5 to 10% by weight). (4%) 0.1 to 2.0% by weight (preferably 0.1 to 1.5% by weight) of zinc dialkyldithiophosphate; and (5) 0% by weight of nonmetallic antioxidant. 0.05 to 2.0% by weight
(Preferably 0.1-1.0% by weight).

The present invention also has a kinematic viscosity at 40 ° C. of 22 to
300 mm ² / s (preferably 22 to 140 mm ² /
There is also a lubricating oil composition for a diesel internal combustion engine, wherein at least the following components are dissolved or dispersed in the base oil of s). (1) Overbased alkyloxybenzenesulfonic acid calcium salt detergent is 0.1 to 2.5% by weight in terms of Ca amount.
(Preferably 0.25 to 1.26% by weight); (2) 0.005 to 2.0% by weight (preferably 0.06%) of neutral or basic calcium salicylate detergent in terms of Ca amount. (3) The ashless succinimide dispersant is 0.0% in terms of N content.
01 to 0.15% by weight (preferably 0.008 to 0.
(4%) zinc dialkyldithiophosphate is 0.0% in terms of P content.
01 to 0.15% by weight (preferably 0.001 to 0.
And (5) the phenol antioxidant is 0.05 in terms of solid content.
To 2.0% by weight (preferably 0.1 to 1.0% by weight).

[0011] The present invention also resides in an additive composition for lubricating oil, characterized in that at least the following components are dissolved or dispersed in a base oil. (1) 5.0 to 90.0% by weight (preferably 10.0%) of an overbased alkyloxybenzene sulfonate detergent
(2-5) neutral or basic salicylate detergent.
0 to 90.0% by weight (preferably 5.0 to 50.0% by weight); (3) 0.5 to 50.0% by weight of ashless dispersant (preferably 2.5 to 50. (4%) 0.5 to 15.0% by weight of zinc dialkyldithiophosphate.
(Preferably 0.5 to 7.5% by weight); and (5) 0.1 to 15.0% by weight of the nonmetallic antioxidant.
(Preferably 0.5-5.0% by weight).

The present invention also provides a lubricating oil additive composition characterized in that at least the following components are dissolved or dispersed in a base oil. (1) Overbased alkyloxybenzenesulfonic acid calcium salt detergent is 0.5 to 12.0% by weight in terms of Ca amount.
(Preferably 0.5 to 6.30% by weight); (2) 0.3 to 10.0% by weight of a neutral or basic calcium salicylate detergent in terms of Ca (preferably 0.3 to 0.3% by weight); (4.1 wt%); (3) The ashless succinimide dispersant is 0.0% in terms of N content.
05 to 1.0% by weight (preferably 0.04 to 0.30
(4) Zinc dialkyldithiophosphate is 0.0% in terms of P content.
05 to 1.1% by weight (preferably 0.005 to 0.5%
(5% by weight); and (5) the phenol antioxidant is 0.1% in terms of an active ingredient.
１５15.0% by weight (preferably 0.5 to 5.0% by weight).

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The base oil used in the lubricating oil composition of the present invention has a kinematic viscosity at 40 ° C. of 22 mm ² / s to 300 mm ^2.
/ S ^{(preferably, 22mm 2 / s~140mm 2 / s} )
Mineral oil or synthetic oil. As mineral oil, lubricating oil fraction obtained by distilling crude oil under atmospheric pressure or reduced pressure is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, hydrorefining, etc. Oil base oils can be used.

The lubricating oil composition of the present invention contains 1.0 to 2 overbased alkyloxybenzene sulfonate detergents.
0.0% by weight, preferably 2.0 to 10.0% by weight
(A ratio based on the total amount of the lubricating oil composition, which is used in the production of the overbased alkyloxybenzene sulfonate detergent, and contains a small amount of the remaining hydrocarbon oil). When the overbased alkyloxybenzene sulfonate detergent is a calcium salt of an overbased alkyloxybenzene sulfonic acid, the amount of the overbased alkyloxybenzene sulfonate detergent is calculated in terms of calcium (Ca) amount. , About 0.1 to 2.5% by weight, and about 0.25 to 1.26% by weight.

The overbased alkyloxybenzene sulfonate detergent used in the present invention is described in JP-A-9-511015.
Can be produced by the method described in Japanese Patent Application Laid-Open Publication No. H11-260, 1988. That is, oxybenzene is alkylated with an olefin having 40 to 80% by weight of an internal olefin to form an alkyloxybenzene, and then the alkyloxybenzenesulfonic acid obtained by sulfonation is neutralized and overbased. An overbased alkyloxybenzene sulfonate can be produced. As the overbased alkyloxybenzene sulfonate detergent, TBN (total base number: a value measured according to JIS-K2501, the unit is mgKOH / g) is 200 or more, and especially TBN is 25.
Calcium salts of zero or more overbased alkyloxybenzene sulfonic acids are advantageously used.

If the amount of the overbased alkyloxybenzene sulfonate detergent in the lubricating oil composition is less than 1.0% by weight, the lubricating oil cannot be provided with sufficient oxidation stability, and The increase in oil viscosity cannot be sufficiently suppressed. Also, even if the compounding amount exceeds 20.0% by weight,
There is no improvement in the effect of addition corresponding to the increase in the blending amount, which impairs economic efficiency.

The lubricating oil composition of the present invention further comprises a neutral or basic salicylate detergent in an amount of 1.0 to 20.0% by weight, preferably 1.0 to 10.0% by weight (lubricating oil composition). (A ratio based on the total amount, which is used in the production of a neutral or basic salicylate detergent, and contains a small amount of hydrocarbon oil remaining afterwards)). In the case of the calcium salt of salicylic acid, the amount of the salicylate detergent corresponds to about 0.05 to 2.0% by weight and 0.06 to 0.82% by weight, respectively, in terms of Ca amount. The preferred amount of the neutral or basic salicylate detergent in the lubricating oil composition of the present invention is in the range of 1.5 to 10.0% by weight, particularly 1.5 to 6.5% by weight. Is the amount of the range.

The salicylate detergent can be produced, for example, by using salicylic acid having a hydrocarbon group such as an alkyl group having 12 to 30 carbon atoms as a raw material according to a known production method. As the salicylate detergent, an alkaline earth metal salt such as a calcium salt or a magnesium salt of a salicylic acid derivative having a normal hydrocarbon group can be used, and various mixtures such as a mixture of salicylate and phenate can also be used. Can be. As the salicylate detergent, one having a TBN of 60 to 250 is usually used.
A calcium salt of an overbased salicylic acid of 0 or more, more preferably TBN of 200 or more can be advantageously used.

If the amount of the neutral or basic salicylate detergent in the lubricating oil composition is less than 1.0% by weight, the lubricating oil cannot be provided with sufficient thermal stability.
Water is easily decomposed, and TBN is easily reduced. Further, even if the compounding amount exceeds 20.0% by weight, an increase in the effect corresponding to the increase in the amount cannot be expected,
Impair economics.

The lubricating oil composition of the present invention may further contain an ashless dispersant in an amount of 0.1 to 10.0% by weight, preferably 0.5 to 1%.
0.0% by weight (based on the total amount of the lubricating oil composition, which is used in the production of the ashless detergent and contains the hydrocarbon oil remaining in a small amount thereafter). When the ashless dispersant is a succinimide dispersant, the compounding amount of the ashless dispersant is about 0.1 in terms of nitrogen (N).
001 to 0.15% by weight and about 0.008 to 0.06
% By weight. A particularly preferred amount of the ashless dispersant is in the range of 0.5 to 4.0% by weight.

Examples of the ashless dispersant used in the lubricating oil composition of the present invention include monoimide or bisimide and ashless dispersants obtained by modifying these with an organic acid. The ashless dispersants preferably used are succinimide dispersants. The succinimide dispersant is, for example, polybutenyl succinic acid obtained by reacting polybutene having an average molecular weight of 800 to 8000 or chlorinated polybutene having an average molecular weight of 800 to 8000 with maleic anhydride at a temperature of 100 to 200 ° C. It can be produced by reacting with a polyamine. As the polyamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethyleneheptamine and the like can be used. The succinimide dispersant used in the present invention is preferably a borated product thereof. The borated succinimide dispersant can be obtained, for example, by adding boric acid or a boric acid derivative to the above-mentioned polybutenylsuccinic polyamine reaction product and reacting the product.

If the amount of the ashless dispersant in the lubricating oil composition is less than 0.1% by weight, sufficient sludge dispersibility cannot be imparted, and the stability when water is mixed in is poor. Become.
If the amount is more than 10.0% by weight, the thermal stability tends to decrease.

The lubricating oil composition of the present invention contains 0.1 to 2.0% by weight, preferably 0.1 to 1.5% by weight of zinc dialkyldithiophosphate (Zn-DTP) (lubricating oil composition). (Which is used in the production of zinc dialkyldithiophosphate and contains a small amount of hydrocarbon oil remaining afterwards)). The amount of the zinc dialkyldithiophosphate is about 0.001 to 0.15% by weight and 0.00
1 to 0.11% by weight.

As the alkyl group of the zinc dialkyldithiophosphate, a linear or branched primary, secondary, or tertiary alkyl group having 2 to 18 carbon atoms, for example, ethyl, propyl, Mention may be made of isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl, octyl, decyl, dodecyl and octadecyl.

When the amount of the zinc dialkyldithiophosphate in the lubricating oil composition is less than 0.1% by weight, sufficient lubricating oil cannot be provided with sufficient oxidation stability, and 2.0% by weight.
No remarkable improvement in performance can be seen even if it exceeds.

The lubricating oil composition of the present invention further comprises a non-metallic antioxidant in an amount of 0.05 to 2.0% by weight, preferably 0.1 to 1.0% by weight, particularly preferably 0.2 to 1.0% by weight. 0.6
% By weight (ratio of active ingredient to total amount of lubricating oil composition)
Included in amounts in the range When the amount of the nonmetallic antioxidant is 0.
If the amount is less than 05% by weight, a sufficient antioxidant effect cannot be expected, and if the amount exceeds 2.0%, further improvement of the antioxidant effect cannot be expected much.

The nonmetallic antioxidant used in the lubricating oil composition of the present invention is preferably a phenolic antioxidant,
Specific examples of the compound include 2,6-di-t-butyl-p-cresol and 4,4′-methylenebis (2,6-
Di-t-butylphenol), 4,4′-thiobis (2
-Methyl-6-t-butylphenol), 2,2'-thio-diethylenebis [3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate], and 3
Hindered phenols such as isooctyl- (3,5-di-t-butyl-4-hydroxyphenyl) propionate can be mentioned. These phenolic antioxidants may be used alone or in combination. Also, a phenolic antioxidant may be used in combination with another non-metallic antioxidant. As the nonmetallic antioxidant, a phenol-based antioxidant is preferable, but an amine-based antioxidant, a dithiocarbamate-based antioxidant, or a sulfur-based antioxidant can also be preferably used.

The lubricating oil composition of the present invention can be produced by adding each component to the base oil separately, simultaneously or sequentially. Alternatively, the additive composition can be prepared by preparing a 5-fold concentration of the additive composition in advance and mixing it with a base oil.

[0029]

EXAMPLES [Examples 1 to 6] Lubricating oils for diesel internal combustion engines having an SAE viscosity grade of 40 and a total base number (measured by TBN: D2896) of 30 using the following additive components in an appropriate combination: A composition was prepared. Specific combinations in each example are shown in Table 1 (unit is% by weight).

(1) Overbased alkyloxybenzene sulfonate detergent 300 TBN calcium phenoxy sulfonate (Ca content: 12.3% by weight) (2) Neutral or basic salicylate detergent (2A) 230 TBN calcium・ Salicylate (C
(a content: 8.2% by weight) (2B) 270 TBN of calcium, oxybenzene,
Carboxylate-sulfurized phenate complex (Ca content: 9.6% by weight) (3) Ashless dispersant (3A) Succinimide (N content: 0.66% by weight) (3B) Borated succinic acid Imide (N content: 1.5% by weight, B content: 0.5% by weight)

(4) Zinc dialkyldithiophosphate (Zn
-DTP) Zinc dialkyldithiophosphate having 8 carbon atoms in the alkyl group (P content: 7.4% by weight) (5) Nonmetallic antioxidant Hindered phenol propionate (6) Base oil ( 6A) Paraffin-based 500 NL base oil (kinematic viscosity at 40 ° C. is 100 mm ² / s) (6B) Paraffin-based 150 bright stock base oil (4
(Kinematic viscosity at 0 ° C. is 480 mm ² / s) (7) 255 TBN calcium phenate (Ca content: 9.2% by weight) (8) 300 TBN calcium sulfonate (Ca content: 11.8% by weight)

[Evaluation of Lubricating Oil Composition for Diesel Internal Combustion Engine] The lubricating oil performance of the lubricating oil compositions for diesel internal combustion engines of Examples 1 to 6 was evaluated by the following tests. Table 1 shows the evaluation results. 1) ISOT (165.5 ° C./72 hours) test 1-1) Measurement of increase in viscosity (40 ° C.) (indicated by increase ratio) 1-2) Increase in TAN (total acid value: measured by D664) ( 1-3) TBN (total base number: measured value by HCL) maintenance rate (%) 2) Hot tube test 325 ° C./16 point evaluation after elapse of 16 hours (10 points for clean state)
Point)

[0033]

[Table 1] Table 1-Additives / base oil 1 Example 2 Example 3 Example 4 Example 5 Example 6 ── (1) 6.97 6.97 6.97 6.97 6.97 4.96 (2A) --- 3.91 3.91 3.91 3.91 6.52 (2B) 3.33- − −− −− −− −− (7) −− −− −− −− −− −− (8) −− −− −− −− −− −− (3A) −− −− 2.0 − − −− −− (3B) 2.0 2.0 −− 1.5 2.0 2.0 (4) 0.67 0.67 0.67 0.67 0.67 0.67 (5) 0 0.3 0.3 0.3 0.3 0.1 0.3 mm ─────────────────────── (6A) 65.0 64.7 64.7 64.9 64.7 64.1 (6B) 21.7 21.5 21.5 21.7 21.6 21.4 １ 1-1 1.16 1.09 1.11 1.12 1.12 1.16 1-2 1.15 0.85 0.97 0.98 1.11 1.20 1-3-38.345 .8 42.8 42.8 40.0 38.5} 2 6.0 7.0 6.5 6.5 6.5 7.0 ─────

[Comparative Examples 1 to 4] The SAE viscosity grade was 40 using appropriate combinations of the additive components described in the examples.
And the total base number (measured by TBN: D2896) is 3
No. 0 lubricating oil composition for diesel internal combustion engines was produced. Specific combinations in each comparative example are shown in Table 2 (unit is% by weight).

[Evaluation of Lubricating Oil Composition for Diesel Internal Combustion Engine] The lubricating oil performance of the lubricating oil compositions for diesel internal combustion engines of Comparative Examples 1 to 4 was evaluated by the tests described in Examples. Table 2 shows the evaluation results.

[0036]

[Table 2] Table 2 Additives / Base oil Comparative examples 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 ──────────────────────────────────── (1) 6 0.97 6.97 9.97 --- (2A) --- --- 13.0 (2B) --- --- --- (7) 3.51 2.0----(3A)-------(3B) 2.0 2.0 2.0 2.0 (4) 0.67 0.67 0.67 0.67 (5 ) 0.3 0.3 0.3 0.3 ──────────────────────────────────── ( 6A) 65.0 66.1 65.2 63.0 (6B) 21.6 22.0 21.8 21.0 ─────────────────────────────── 1-1 1.26 1.34 1.15 1.25 1-2 1 .59 1.98 1.10 1.49 1-3 30.0 29.5 38.3 34.5} {2 4.5 3.0 4.5 7.0} ───────────

A comparison between the data of Table 1 showing the data of the examples of the present invention and the data of Table 2 showing the data of the comparative examples shows that the lubricating oil composition for a diesel internal combustion engine of the present invention has an ISOT
Both the rise in viscosity and the rise in TAN in the test are low, the retention rate of TBN is high, the contamination by the lubricating oil oxide in the hot tube test is small, and the lubricating oil composition for a diesel internal combustion engine of the comparative example has an ISOT test. In comparison with the lubricating oil composition for a diesel internal combustion engine of the present invention, one or more of the viscosity increase and the TAN increase, the TBN retention rate, and the contamination with the lubricating oil oxide in a hot tube test are evident. It turns out that it is inferior.

[0038]

The lubricating oil composition of the present invention exhibits thermo-oxidative stability and high-temperature detergency that is well suited to the harsh operating conditions of modern marine and onshore diesel engines.
That is, the lubricating oil composition of the present invention has a particularly high load,
When used as a lubricating oil composition for a diesel engine that operates continuously for a long period of time, the increase and consumption of the viscosity of the lubricating oil are suppressed, and it is also used for fuel impurities and combustion residue or lubricating oil residue. As a result, the generation of black sludge and the generation of deposits on the piston land and the groove and the piston underside are suppressed, and the wear of the piston top ring and the cylinder liner is also suppressed.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C10M 137: 10 149: 06 155: 04 129: 10) C10N 10:04 20:02 20:04 30:04 30:10 40:25 60:14 F term (reference) 4H104 BB05C BF03C BH07C DA02A DB06C DB07C EA02A EA03C EA21C EB02 FA02 JA18 LA02 LA04 PA42

Claims (19)

[Claims] A kinematic viscosity at 40 ° C. of 22 to 300 mm ^2.
/ S base oil comprising at least the following components dissolved or dispersed in a lubricating oil composition for a diesel internal combustion engine: (1) An overbased alkyloxybenzene sulfonate detergent of 1.0 to 20 (2) neutral or basic salicylate detergent;
(3) 0.1 to 10.0% by weight of ashless dispersant; (4) 0.1 to 2.0% by weight of zinc dialkyldithiophosphate; and (5) 0.05 to 2.0% by weight of a nonmetallic antioxidant. 2. The lubricating oil composition for a diesel internal combustion engine according to claim 1, wherein the overbased alkyloxybenzene sulfonate detergent has a TBN of 200 or more. 3. The lubricating oil composition for a diesel internal combustion engine according to claim 1, wherein the overbased alkyloxybenzene sulfonate detergent is a calcium salt of an overbased alkyloxybenzene sulfonic acid having a TBN of 200 or more. . 4. The lubricating oil composition for a diesel internal combustion engine according to claim 1, wherein the neutral or basic salicylate detergent has a TBN of 60 or more. 5. An ashless dispersant having a molecular weight of 800 to 800.
The lubricating oil composition for a diesel internal combustion engine according to claim 1, which is a succinimide having 0 polybutenyl groups. 6. An ashless dispersant having a molecular weight of 800 to 800.
The lubricating oil composition for a diesel internal combustion engine according to claim 1, wherein the lubricating oil composition is a borated succinimide having a polybutenyl group of 0. 7. The lubricating oil composition for a diesel internal combustion engine according to claim 1, wherein the non-metallic antioxidant is a phenol compound. 8. A kinematic viscosity at 40 ° C. of 22 to 300 mm ^2.
/ S base oil at least the following components are dissolved or dispersed in a lubricating oil composition for a diesel internal combustion engine: (1) The overbased alkyloxybenzenesulfonic acid calcium salt detergent has a Ca content of (2) neutral or basic calcium salicylate detergent is 0.05 to 2.0% by weight in terms of Ca; (3) ashless succinimide The dispersant is 0.0
(4) zinc dialkyldithiophosphate is 0.00% by weight in terms of P amount;
And 0.1 to 0.15% by weight; and (5) a phenol antioxidant in an amount of 0.0
5 to 2.0% by weight. 9. The lubricating oil composition for a diesel internal combustion engine according to claim 8, wherein the overbased alkyloxybenzenesulfonic acid calcium salt detergent has a TBN of 200 or more. 10. The lubricating oil composition for a diesel internal combustion engine according to claim 8, wherein the neutral or basic calcium salicylate detergent has a TBN of 60 or more. 11. A lubricating oil composition for a diesel internal combustion engine according to claim 8, wherein the ashless succinimide dispersant is a borated succinimide having a polybutenyl group having a molecular weight of 800 to 8000. object. 12. An additive composition for lubricating oil comprising at least the following components dissolved or dispersed in a base oil: (1) 5.0 to 5.0 overbased alkyloxybenzene sulfonate detergents. (2) neutral or basic salicylate detergent;
(3) 0.5 to 50.0% by weight of ashless dispersant; (4) 0.5 to 15.0% of zinc dialkyldithiophosphate.
(5) 0.1 to 15.0% by weight of a nonmetallic antioxidant. 13. The additive composition for a lubricating oil according to claim 12, wherein the overbased alkyloxybenzene sulfonate detergent is a calcium salt of an overbased alkyloxybenzene sulfonic acid having a TBN of 200 or more. 14. The lubricating oil additive composition according to claim 12, wherein the neutral or basic salicylate detergent has a TBN of 60 or more. 15. An ashless dispersant having a molecular weight of 800 to 80.
The lubricating oil additive composition according to claim 12, which is a borated succinimide having a polybutenyl group of 00. 16. An additive composition for lubricating oil comprising at least the following components dissolved or dispersed in a base oil: (1) An overbased calcium alkyloxybenzene sulfonate detergent is Ca (2) Neutral or basic calcium salicylate detergent is 0.3 to 10.0% by weight in terms of Ca; (3) Ashless succinic acid The imide dispersant is 0.0
(4) zinc dialkyldithiophosphate in an amount of 0.0
(5) phenol antioxidant is 0.1% in terms of active ingredient.
~ 15.0% by weight. 17. The lubricating oil additive composition according to claim 16, wherein the overbased calcium salt of alkyloxybenzene sulfonic acid has a TBN of 200 or more. 18. The additive composition for lubricating oil according to claim 16, wherein the neutral or basic calcium salicylate detergent has a TBN of 60 or more. 19. The ashless succinimide dispersant is a borated succinimide having a polybutenyl group having a molecular weight of 800 to 8000.
The additive composition for a lubricating oil according to the above.