Claims
- 1. An automatic transmission fluid comprising:
- (A) a boron-containing overbased material;
- (B) -1 a phosphite;
- (B) -2 a monothiophosphate;
- (C) a borated friction modifier;
- (D) a thiocarbamate;
- (E) a shear stable dispersant viscosity modifier; and
- (F) an oil of lubricating viscosity in an amount greater than 50% by weight of said composition;
- wherein said composition is free of polysulfides, and wherein said composition has a -40.degree. C. Brookfield viscosity of less than about 15,000 cP.
- 2. The composition according to claim 1, wherein (B) further comprises phosphoric acid.
- 3. A composition according to claim 1, wherein (A) is a borated overbased magnesium sulfonate.
- 4. A composition according to claim 1, wherein said borated friction modifier is selected from the group consisting of
- (a) borated epoxides;
- (b) borated fatty acid esters of glycerol;
- (c) borated alkoxylated fatty amines
- or mixtures thereof.
- 5. A composition according to claim 1, wherein said borated friction modifier is a borated epoxide.
- 6. A composition according to claim 1, wherein said phosphite is a dialkylhydrogen phosphite and said monothiophosphate is a triaryl monothiophosphate.
- 7. The composition recited in claim 1, wherein said fluid has a 100.degree. C. kinematic viscosity of less than 8.5 cSt.
- 8. The composition recited in claim 7, wherein the 100.degree. C. kinematic viscosity value of said fluid is reduced less than 10% when determined after 40 passes through the FISST apparatus used in ASTM 5275.
- 9. An automatic transmission fluid comprising:
- (A) a boron-containing magnesium sulfonate;
- (B)-1 a dialkyl hydrogen phosphite;
- (B)-2 a triarylmonothiophosphate;
- (B)-3 phosphoric acid;
- (C) a borated epoxide having about 10 to about 20 carbon atoms;
- (E) a shear stable dispersant viscosity modifier; and
- (F) an oil of lubricating viscosity in an amount greater than 50% by weight of said composition;
- wherein said composition is free of polysulfides, and wherein said composition has a -40.degree. C. Brookfield viscosity of less than about 15,000 cP.
- 10. A composition according to claim 9, wherein
- (B)-1 is dibutyl hydrogen phosphite and
- (B)-2 is triaryl monothio phosphate.
- 11. The compositions as recited in claims 1 and 9, wherein said compositions further comprise a dispersant or a borated dispersant or mixtures thereof.
- 12. A composition as recited in claim 9, said composition further comprising (D), a thiocarbamate.
- 13. A composition according to claims 1 and 10, wherein (D) is a thiocarbamate of formula ##STR10##
- 14. A composition according to claims 1 and 12, wherein (D) is S-carbomethoxyethyl-N,N-dibutyl dithiocarbamate.
- 15. The composition recited in claim 9, wherein said fluid has a 100.degree. C. kinematic viscosity of less than 8.5 cSt.
- 16. The composition recited in claim 15, wherein the 100.degree. C. kinematic viscosity value of said fluid is reduced less than 10% when determined after 40 passes through the FISST apparatus used in ASTM 5275.
Parent Case Info
This is a continuation-in-part of application Ser. No. 08/682,217 filed Jul. 17, 1996 now abandoned, which is a continuation-in-part of Ser. No. 08/544,793 filed Oct. 18, 1995, now abandoned.
US Referenced Citations (16)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
682217 |
Jul 1996 |
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Parent |
544793 |
Oct 1995 |
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