JPH09111276A - Lubricant containing carbonated sulfated alkylphenate and carbonated metal alkylaryl sulfonate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition containing a small amount of a metal carbonated sulfurized alkylphenate and a small amount of metal carbonated alkylarylsulfonate and having good solvent dispersibility and good corrosion resistance.

SOLUTION: This lubricating oil comprises (A) a major amount of an oil having a lubricating viscosity, (B) a minor amount of a metal carbonated sulfurized alkylphenate, and (C) a minor amount of a metal carbonated alkylarylsulfonate salt, wherein the equivalents of the whole bases given from the component B is ≥85%, preferably at least 90%, of the equivalents of the whole bases given from the components B and C. The component B has a whole base value of 175-300, a metal/alkylphenate base ratio of 1.1/1 to 4/1, and a carbonate salt/whole metal salt molar ratio of 0.5/1 to 0.75/1, and is preferably a magnesium carbonated alkylarylsulfonate having a whole base value of 300-400 and a metal/sulfonate salt base ratio of 11/1 to 35/1.

COPYRIGHT: (C)1997,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a phenate-containing lubricating oil having good soot dispersibility and good antirust property.

[0002]

2. Description of the Related Art An increase in viscosity due to the accumulation of soot in oil causes a decrease in the flow rate of oil returning to the oil sump, gelation of oil in the oil sump, clogging of filters, etc. Severe damage to a diesel engine can occur as a result of what may result in diminished oil flow to oil cooled components such as pistons.

Rust resistance is an important performance parameter for lubricating oils. Poor rust resistance may result in the valve filter sticking and impairing engine operation.

[0004]

Sulfurized carbonated calcium alkyl phenates are well known as detergents for lubricating oils, including applications in heavy duty diesel crankcases. ing. They have certain advantages over other types of metal detergents, especially sulphonates, in providing lubricating oils with antioxidant properties. Unfortunately, formulations based solely on sulfated calcium carbonate alkyl phenates, such as overbased detergents, lack rust resistance and are usually formulated with special rust inhibitors. These rust inhibitors add to the cost of the formulation and sometimes cause compatibility problems with other additives in the lubricating oil formulation.

It has been discovered that certain combinations of carbonic acid sulfated metal alkylphenates and metal carbonated alkylaryl sulfonates provide both good soot dispersibility and good rust resistance.

US Pat. No. 3,236,770 teaches diesel lubricating oils using a basic sulfonate or basic phenate in combination with a dialkylthiophosphate. Sulfonates and phenates are used as alternatives, not mixtures.

US Pat. No. 4,328,111 discloses diesel lubrication using reaction products of basic compounds (overbased metal sulfonates, phenates, or mixtures thereof) with phosphorus-containing materials. Oil is taught. Mixtures of phenates and sulphonates are not discussed in the specification or in the examples.

US Pat. No. 4,938,881 teaches a diesel lubricating oil using a carboxylic acid-based dispersant, a sulfonic acid or carboxylic acid salt, dithiophosphoric acid, and a carboxylic ester derivative. . It is sulfuric acid,
It may include salts of phosphoric acid, carboxylic acid, phenol, or mixtures thereof. The preferred salt is the salt of alkylated benzene sulfonic acid.

US Pat. No. 5,071,576 teaches a mixture of overbased phenates and overbased alkylaryl sulfonates. The sulfonate has at least one long chain alkyl group (more than 40 carbon atoms). Up to 85% of its base can be attributed to phenates.

US Pat. No. 5,202,036, similar to US Pat. No. 4,938,881, teaches diesel lubricating oils using a carboxylic dispersant and a salt of an acidic organic compound. ing. The salt can be a salt of sulfuric acid, phosphoric acid, carboxylic acid, phenol, or mixtures thereof. A preferred salt is the salt of alkylated benzene sulfonic acid.

European Patent Application EP-552892-A1 teaches diesel lubricating oils using zinc dithiophosphate, antioxidants, overbased metal sulfated phenates, and metal alkyl aromatic sulfonates. Preferably the phenate is 50% to 8% by weight of the phenate / sulfonate.
Although accounting for 0% by weight, the sulfonate is not overbased.

[0012]

The present invention is based on the principle component amount (ma
jor amount) of oil of lubricating viscosity, minor amount
Carbonated sulphated metal phenates and small amounts (mi
A lubricating oil composition is provided comprising a nor amount of a metal carbonate arylalkyl sulfonate.

It is, in part, that the soot dispersibility of the composition is greater when the total base equivalent provided by the phenate is greater than 85% of the total base equivalent provided by the phenate and sulfonate. It is based on the finding that it is excellent. The total base equivalent provided by the phenate is preferably at least 90% of the total base equivalent provided by the phenate and the sulfonate.

Carbonated sulphated metal alkyl phenates are extremely basic and have a total base number of 175-300.
e number) (TBN) and a metal to alkylphenate base ratio of 1.1: 1 to 4: 1. The molar ratio of carbonate to total metallic base is at least 0.4: 1, preferably 0.5: 1 to 0.75: 1. The alkylphenate portion of the molecule is derived from a monoalkylphenol, the alkyl group of which has from about 9 to 28 carbon atoms.

Preferably, the carbonic acid metal alkylaryl sulfonate salt has a total base number of at least 175, most preferably 300 to 400, and a metal to sulfone of at least 8: 1 and most preferably 11: 1 to 35: 1. It is a magnesium carbonate sulfonate having a base ratio of acid salt.

In one embodiment, the lubricating oil is (1) about 2
000 to about 2700 number average molecular weight (Mn) and about 1 to
Succinimide reaction of alkenyl- or alkyl-substituted succinic anhydrides derived from polyolefins having a weight average molecular weight (Mw) / Mn ratio of about 5 with (2) polyalkylene polyamines having more than 4 nitrogen atoms per molecule. It includes a unique class of modified polyaminoalkenyl or alkylsuccinimide compounds derived from the product. The modified succinimide of the present invention is obtained by post-treating the succinimide reaction product with a cyclic carbonate.

Carbonic acid chlorinated sulfated metal alkylphenate,
Carbonated metal alkylaryl sulfonates and succinimide dispersants can be used in combination with the uncarbonated metal sulfonates, antioxidants, viscosity index improvers, and zinc dithiophosphate.

To facilitate understanding of the invention, reference will now be made to the drawings. The drawings are given as examples only,
It should not be considered as limiting the invention.

In its broadest aspect, the present invention includes a lubricating oil composition comprising a major amount of oil of lubricating oil viscosity, a minor amount of a carbonated sulfated metal alkyl phenate and a minor amount of a carbonated metal alkylaryl sulfonate. .

It has been found that, in part, excellent soot dispersancy results are obtained when the total base equivalent provided by the phenate is greater than 85% of the total base equivalent provided by the phenate and the sulfonate. Is based on. The total base equivalent provided by the phenate is preferably at least 90% of the total base equivalent provided by the phenate and the sulfonate.

Base Oil The base oil used with the additive composition of the present invention may be a mineral oil of synthetic viscosity or a synthetic oil, preferably suitable for use in the crankcase of an internal combustion engine. Lubricating oils can be derived from synthetic or natural sources. Mineral oil used as the base oil of the present invention includes paraffinic,
Included are naphthenic and other oils commonly used in lubricating oil compositions. Synthetic oils include both hydrocarbon synthetic oils and synthetic esters. Useful synthetic hydrocarbon oils include
Included are liquid polymers of alpha olefins having suitable viscosities. Particularly useful is C such as 1-decent trimer.
₆ is a -C ₁₂ alpha olefins hydrogenated liquid oligomers.
Similarly, an alkylaryl of suitable viscosity such as didodecylbenzene can be used. Useful synthetic esters include esters of both monocarboxylic and polycarboxylic acids, as well as monohydroxyalkanols and polyols. Typical examples are didodecyl adipate, pentaerythritol tetracaproate, di-2-ethylhexyl adipate, dilauryl sebacate and the like. Complex esters prepared from mixtures of mono and dicarboxylic acids and mono and dihydroxy alkanols can also be used.

Mixtures of hydrocarbon oils and synthetic oils are also useful. For example, 10-25% by weight of hydrogenated 1-centrifuge and 75-90% by weight of 150 SUS (100 °
F) Mixture with mineral oil gives an excellent lubricating base oil.

Although the examples described below deal with heavy duty diesel engine oils, the invention also applies to gasoline-powered engines, as well as to general type internal combustion engines having crankcase lubrication systems. You can

Carbonated Sulphated Metal Sulfonated Alkyl Phenates Preferably, the carbonated sulphated sulphated metal alkylphenates are highly basic, at least 175, most preferably 1
It has a total base number of 75 to 300 and a base ratio of metal to alkylphenate of at least 1.1: 1, most preferably 1.5: 1 to 4: 1. The molar ratio of carbonate to total metal base is at least 0.4: 1, preferably 0.5 :.
It is 1 to 0.75: 1. The alkylphenate portion of the molecule is derived from a monoalkylphenol, the alkyl group of which has from about 9 to 28 carbon atoms. The preferred metal is calcium. The alkyl group may be branched or straight chain or a mixture thereof. Such carbonated sulfated metal alkyl phenates are referred to as "Process for Basic Sulfurized Metal Phenates".
Walter W. Phenates). Hannemann (Walt
Er. W. Hanneman) U.S. Pat. No. 3,178,368.
No., which is hereby incorporated by reference for all purposes.

Metal Carbonated Alkyl Aryl Sulfonates Preferably, the metal carbonated alkyl aryl sulfonates are also highly basic, having a total base number of at least 175, most preferably 300 to 400, at least 8: 1,
Most preferably it has a metal to sulphonate base ratio of 11: 1 to 35: 1. These sulphonates can be derived by sulphonating naturally occurring aromatics present in the base heavy oil or by sulphonating alkylated aromatics. Such carbonated metal alkylaryl sulfonates are described in "Methods for Preparing Overbath".
asedCalcium Sulfonates). C. Joe
US Pat. No. 5,132,033 by o), which is hereby incorporated by reference for all purposes.
It is described in.

For the purposes of the present invention, the metal is preferably magnesium. This is because magnesium sulfonate gives excellent performance in the Sequence IID rust test and gives a higher total base number per 1% by weight of sulfated chlorinated ash.

Modified Polyaminoalkenyl or Alkylsuccinimide The modified polyaminoalkenyl or alkylsuccinimides useful in the present invention are prepared by post-treating the polyaminoalkenyl or alkylsuccinimide with a cyclic carbonate. Polyaminoalkenyl or alkyl succinimides are typically prepared by reacting an alkenyl or alkyl succinic anhydride with a polyamine.

Alkenyl or alkyl succinimides have been described in many references and are well known in the art. Certain basic classes of succinimides and related materials within the technical term “succinimide” are described in US Pat. Nos. 2,992,708, 3,018,291,
No. 3,024,237, No. 3,100,673, No. 3,219,666, No. 3,172,892, and No. 3,272,746 (these descriptions are for reference only). Included here). The term "succinimide" is understood in the art to include amides, imides, and many of the amidine materials also formed by this reaction. However, the predominant product is succinimide, which term is generally taken to mean the reaction product of an alkenyl- or alkyl-substituted succinic acid or its anhydride with a polyamine.

Succinic Anhydride Reactants Thermal processes for making alkenyl- or alkyl-substituted succinic anhydrides, including the reaction of polyolefins with maleic anhydride, have been reported in the art. This thermal method is characterized by the thermal reaction of polyolefin with maleic anhydride. Alternatively, alkenyl- or alkyl-substituted succinic anhydrides are described in US Pat. Nos. 4,388,471 and 4,450,281, which are hereby incorporated by reference. It can be manufactured in this manner. Another example of the preparation of alkenyl or alkyl substituted succinic anhydrides is taught in US Pat. Nos. 3,018,250 and 3,024,195, which are hereby incorporated by reference. ing.

Preferably, the alkenyl or alkyl succinic anhydride reactant is derived from a polyolefin having a Mn of about 2000 to about 2700 and a Mw / Mn ratio of about 1 to about 5. In a preferred embodiment, the alkenyl or alkyl group of succinimide has about 2100 to about 2400.
With a Mn value of.

Polyols suitable for reaction with maleic anhydride
The fin polymer contains C as a main component._Two~ C_FiveMonoolefi
For example, ethylene, propylene, butylene, isobutene
Included are polymers including ethylene and pentene. Those
Polymers are homopolymers such as polyisobutylene,
Ethylene and propylene, butylene, and isobutylene
Two or more such olefins such as copolymers
It may be a copolymer. Other copolymers include copolymer
A small amount of the monomer, for example, 1 to 20 mol% is C_Four~ C ₈Giolet
Copolymers that are fins, such as isobutylene and butadiene
Copolymer with ene, or ethylene, propylene, and
A copolymer of 1,4-hexadiene and the like are included.

A particularly preferred class of olefin polymers for reaction with maleic anhydride consists of polybutene prepared by the polymerization of one or more of 1-butene, 2-butene, and isobutene. Particularly desirable are polybutenes containing a substantial proportion of units derived from isobutene. The polybutene may contain small amounts of butadiene, which may or may not be incorporated into the polymer. These polybutenes are readily available commercial materials well known to those skilled in the art. For a description thereof, see, for example, US Pat. No. 3,215,707.
No. 3,231,587, 3,515,669
No. 3,579,450, and 3,912,76
It can be found in U.S. Pat. Nos. 4,152,499 and 4,605,808 as well as U.S. Pat. These references are included here for reference in the description of suitable polybutenes.

Suitable succinic anhydride reactants include polyalkylene groups and succinic acid such as those taught in US Pat. No. 5,112,507, which is hereby incorporated by reference. Copolymers with alternating groups are also included.

Polyamine Reactants The polyamines that are reacted with the alkenyl or alkyl succinic anhydrides to produce the polyaminoalkenyl or alkyl succinimides used in this invention are generally polyalkylene polyamines. The polyalkylene polyamine preferably has an average nitrogen atom to molecular ratio of greater than 4.0 and up to about 12. Most preferred are polyamines having an average nitrogen atom to molecular ratio of about 5 to about 7.

The preferred polyalkylene polyamines have from about 4 to about 40 carbon atoms, preferably from 2 to 3 carbon atoms per alkylene unit. The polyamine preferably has a carbon to nitrogen ratio of about 1: 1 to about 10: 1.

The process for preparing polyamines and their reactions is described in Sidgewick's "Organic Chemistry of Nitrogen".
(The Organic Chemistry of Nitrogen) [1966,
Oxford, Clarendon Pr
ess)]; Noller's "Chemistry of Organic Compounds" (Chemi
stry of Organic Compounds, 2nd edition [1957, Philadelphia, Saunders]; and Kirk-Othmer, Encyclopedia.
Of Chemical Technology, 2nd Edition, especially Volume 2,
See pages 99-116;

The reaction of alkenyl or alkyl succinic anhydrides with polyamines to produce polyaminoalkenyl or alkyl succinimides is well known in the art and is described in US Pat. Nos. 2,992,708, 3,0.
18,291, 3,024,237, 3,10
0,673, 3,219,666, 3,17
2,892, and 3,272,746. These documents are included here for their reference to the preparation of alkenyl or alkyl succinimides.

In general, a suitable number of moles of polyamide to alkenyl or alkyl succinic anhydride for preparing the compounds of this invention is from about 0.35: 1 to about 0.6: 1.
However, it is preferably about 0.4: 1 to about 0.5: 1. As used herein, the term "moles of polyamine to alkenyl or alkyl succinic anhydride" means the ratio of mols of polyamine to mols of succinic groups in the succinic anhydride reactant.

Post-Treatment of Polyaminoalkenyl or Alkylsuccinimide with Cyclic Carbonate The polyaminoalkenyl or alkylsuccinimide formed as described above is then reacted with a cyclic carbonate. The resulting modified polyaminoalkenyl succinimide is one in which one or more nitrogen atoms of the polyamino moiety is hydroxyhydrocarbyloxycarbonyl, hydroxypoly (oxyalkylene) oxycarbonyl, hydroxyalkylene, hydroxyalkylenepoly (oxyalkylene), or mixtures thereof. Has been replaced.

The reaction of the polyaminoalkenyl or alkylsuccinimide with the cyclic carbonate is carried out at a temperature sufficient to cause the reaction of the polyaminoalkenyl or alkylsuccinimide with the cyclic carbonate. Particularly, a reaction temperature of about 20 ° C. to about 250 ° C. is preferable, and about 1
A temperature of 00 ° C to 200 ° C is more preferable, and 150 ° C to 1 ° C.
Most preferred is a temperature of 80 ° C.

The reaction may be carried out neat, in which case both the alkenyl or alkyl succinimide and the cyclic carbonate in the appropriate ratios, alone or in the catalyst (eg acidic, basic or Lewis acid catalysts). Are added together and then stirred at reaction temperature. Examples of suitable catalysts include, for example, phosphoric acid, boron trifluoride, alkyl or aryl sulfonic acids, alkali or alkaline earth carbonates.

Alternatively, the reaction may be carried out in a diluent. For example, the reactants may be combined in a solvent such as toluene, xylene, oil, etc. and then stirred at reaction temperature. After the reaction is complete, volatile components may be removed.
When a diluent is used, it is preferably inert to the reactants and the products formed and is generally used in an amount sufficient to provide sufficient agitation.

General Procedures for Making Zinc Dithiophosphates and their Corresponding Metal Salts are described in US Pat. No. 3,089,85.
No. 0, No. 3,102,096, No. 3,293,181
And 3,489,682, which are hereby incorporated by reference for all purposes. It is preferred that 100% of the zinc dithiophosphate be derived from the secondary alcohol. Zinc dithiophosphate is believed to be a means of providing better oxidative stability and improved wear resistance.

Examples of metal compounds that can be reacted with dithiophosphoric acid to produce zinc dithiophosphate include zinc oxide, zinc hydroxide, zinc carbonate, and zinc propylate.

The total amount of zinc dithiophosphate present is 3-30, preferably 10-20, zinc per kg of final product.
It is in the mM range (mM). The reason for this range is 1
If it is less than 0 mM / kg, the continuous valve wear performance may be impaired, and if it is more than 20 mM / kg, the problem of phosphorus poisoning of the catalytic converter may occur.

Other Additives Other additives that may be present in the lubricating oil composition include antioxidants, extreme pressure additives, friction reducers, rust inhibitors, antifoam agents, corrosion inhibitors, Included are metal deactivators, pour point depressants, anti-aging agents, anti-wear agents, viscosity index improvers, anti-stick agents, and various other well known additives.

[0047]

The invention is further illustrated by the following examples which describe particularly advantageous method aspects. The examples are given to illustrate the invention and not to limit it.

Although the examples described below deal with heavy duty diesel engine oils, the invention applies equally to gasoline-powered engines, and internal combustion engines of the general type having a crankcase lubrication system. You can

[0049]

【Example】

Example 1 (Comparative) A heavy duty diesel lubricating oil composition was prepared as described below.
Blended as TBN oil. Conventional commercial oil is 0.25
Although containing 0.75 wt% rust inhibitor, the examples set forth below were formulated without rust inhibitor to illustrate the benefits of the present invention.

Ingredients % by Weight Base Equivalent Sulfated Carbonated Metallic Phenate 2.1 50 (250 TBN, Base Ratio 1.9: 1) Polyaminoalkenyl or alkyl succinimide 5.5 Low overbased calcium sulfonate 1.6 Zinc dithiophosphate 1.4 Molybdenum inhibitor 0.2 Viscosity Index improver 7.0 Base oil residual

Example 2 A second lubricating oil composition was treated with 7TBN as described in Example 1.
Mixed as an oil. However, a portion of the sulfated carbonated metal phenate was replaced with magnesium carbonated alkyl sulfonate so that 10% of the total base equivalents provided by the carbonated detergent were due to magnesium sulfonate, as described below. did.

Ingredient Weight% Base Equivalent Sulfated Carbonated Metal Phenate 1.9 45 Carbonated Magnesium Alkylsulfonate 0.13 5 (400 TBN, Base Ratio 15: 1)

Examples 3-7 Further lubricating oil compositions were mixed as described in Example 2 above. However, the relative amounts of the sulfated carbonic acid metal phenate and magnesium carbonated carbonic acid alkylsulfonate were changed as follows.

Example Weight% Phenate Metal base Weight% Phenate Metal base Equivalent% Equivalent% 3 2.0 47.5 95 0.065 2.5 5 4 ★ 1.8 42.5 85 0.195 7.5 15 5 ★ 1.7 40 80 0.26 10 20 6 ★ 1.6 37.5 75 0.325 12.5 25 7 ★ 1.05 25 50 0.65 25 50 ★ Note that Examples 4 to 7 are comparative examples.

Example 8: Soot Dispersion In this example, the formulations of Examples 1-7 were dispersed on a bench.
It was evaluated in the test. This test provides a rapid method for determining the oil's ability to inhibit soot content increase in viscosity. In this test, carbon black was added to the final oil. The mixture was mixed well and degassed in a vacuum oven. The viscosity of the oil was measured at 100 ° C. before and after adding carbon black. Oils with low dispersibility show a greater increase in viscosity due to the aggregation of carbon black in the oil.

In this test, a 5% difference in viscosity increase is 95%
Was considered to be significant with the reliability of. The results are summarized in the table below.

[0057]

The drawing is a graph of this test data.
Note that a substantial improvement in soot dispersibility is obtained when the phenate constitutes more than 85% of the metal base.

Example 9: Anticorrosion In this example, the formulations of Examples 1-4 were evaluated in a modified D665 rust bench test. This test is a test designed to evaluate the oil's ability to prevent rust formation in crankcase internal combustion engines. In this test, oil was placed in a stirred beaker heated to 80 ° C. Pre-cleaned metal pieces were suspended in oil and a sufficient amount of dilute (0.2N) aqueous hydrochloric acid was added to neutralize any base present in the oil. The oil / diluted acid mixture was then stirred at 80 ° C. for 7 hours, at which point stirring was stopped and the metal strip removed.

The test pieces were rinsed with heptane to remove oil and left in the oven until used for evaluation. CRC the test piece
It was evaluated using a rust and varnish scale. On this scale, 10 is a perfectly clean case, 0 is 100
% When covered with rust. Four oils were tested and evaluated. The following results were obtained.

Example Metal% from phenate Rust grade (10 = clean) 1 100 8.26 3 95 8.76 2 90 8.6 4 85 8.8

It can be seen that increasing the content of magnesium sulfonate improves the rust resistance, as evidenced by the improved rust rating.

Although the present invention has been described with respect to particular embodiments, it is intended that the present application cover various changes and substitutions made by those skilled in the art without departing from the scope and spirit of the claims.

[Brief description of the drawings]

FIG. 1 is a graph of test data showing the criticality of soot dispersibility on the% of total base equivalents provided by phenate, relative to the total base equivalents provided by phenate and sulfonate.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C10N 10:04 30:04 30:10 30:12

Claims (9)

[Claims] 1. A composition comprising: (a) a major amount of oil of lubricating viscosity; (b) a small amount of a carbonic acid sulfated metal alkyl phenate; and (c) a small amount of a metal carbonated metal alkylaryl sulfonate. The total base equivalents provided by the phenate is greater than 85% of the total base equivalents provided by the phenate and the sulfonate.
Lubricating oil composition. 2. The lubricating oil composition according to claim 1, wherein the total base equivalent provided by the phenate is at least 90% of the total base equivalent provided by the phenate and the sulfonate. 3. Carbonated sulphated metal alkylphenate having a total base number of 175 to 300, 1.1: 1 to 1.
Having a metal to alkylphenate base ratio of 4: 1,
A carbonated sulphated calcium alkylphenate having a molar ratio of carbonate to total metal base of 0.5: 1 to 0.75: 1, wherein the alkyl group has about 9 to 28 carbon atoms. The lubricating oil composition according to claim 1, which is 4. The carbonic acid metal alkylaryl sulfonate has a total base number of 300 to 400, 11: 1 to 35:
2. A magnesium carbonate alkylaryl sulfonate having a metal to sulfonate base ratio of 1.
The lubricating oil composition according to the above. 5. The succinimide is (a) Mn of 2000-2700 and Mw of 1-5.
A reaction product of an alkenyl- or alkyl-substituted succinic anhydride derived from a polyolefin having a Mn ratio and (b) a polyalkylene polyamine having an average nitrogen atom-to-molecular ratio greater than 4.0, the reaction product of which is The lubricating oil composition of claim 1, further comprising a minor amount of a polyaminoalkenyl or alkyl succinimide, which is post-treated with a cyclic carbonate. 6. The molar ratio of polyamine to succinic anhydride (polyamine to succinic anhydride) is 0.35: 1 to 0.
6. The ratio of 6: 1 and the molar ratio of cyclic carbonate to basic amine nitrogen in the reaction product (cyclic carbonate to basic amine nitrogen) is from 1.5: 1 to 4: 1. Lubricating oil composition. 7. The lubricating oil composition according to claim 5, wherein the polyolefin has a Mn of 2100 to 2400. 8. The lubricating oil composition of claim 5, wherein the polyalkylene polyamine has an average nitrogen atom to molecular ratio of 5-7. 9. (a) a major amount of oil of lubricating viscosity; (b) a small amount of carbonated sulfated calcium alkyl phenate; (c) a small amount of carbonated magnesium alkyl aryl sulfonate provided by said phenate. A total carbonate equivalent of greater than 85% of the total base equivalent provided by the phenate and the sulfonate; magnesium carbonate alkylaryl sulfonate; (d) a small amount of an uncarbonated metal alkylaryl sulfonate; (e) With a small amount of polyaminoalkenyl or alkyl succinimide, the amount of said succinimide is less than about 3% by weight, based on dry polymer, while said succinimide is (i) Mn of 210-240 and Mn of 1-5. M
an alkenyl- or alkyl-substituted succinic anhydride derived from polyisobutene having a w / Mn ratio, (ii)
A polyalkylene polyamine having an average nitrogen atom to molecular ratio of greater than 4, and a reaction product having a polyamine to succinic anhydride molar ratio of 0.4: 1 to 0.5: 1. The reaction product is then backed with ethylene carbonate in a molar ratio such that the molar ratio of ethylene carbonate to basic amine nitrogen in the succinimide reaction product (ethylene carbonate to basic amine nitrogen) is 2: 1 to 3: 1. A lubricating oil composition comprising: (f) a small amount of an antioxidant; (g) a small amount of a viscosity index improver; and (h) a small amount of zinc dithiophosphate.