CPC C10M 169/045 (2013.01) [C10M 101/00 (2013.01); C10M 125/24 (2013.01); C10M 129/52 (2013.01); C10M 133/04 (2013.01); C10M 133/16 (2013.01); C10M 2207/262 (2013.01); C10M 2215/08 (2013.01); C10M 2215/086 (2013.01); C10M 2217/043 (2013.01); C10M 2219/046 (2013.01); C10M 2223/043 (2013.01); C10M 2223/045 (2013.01); C10M 2223/049 (2013.01); C10M 2223/06 (2013.01); C10N 2010/02 (2013.01); C10N 2010/04 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2030/04 (2013.01); C10N 2030/06 (2013.01); C10N 2030/10 (2013.01); C10N 2030/36 (2020.05); C10N 2030/42 (2020.05); C10N 2030/45 (2020.05); C10N 2030/52 (2020.05); C10N 2040/253 (2020.05); C10N 2060/14 (2013.01)] | 10 Claims |
1. A low zinc lubricating composition comprising:
an oil of lubricating viscosity;
1.0 wt. % to 3 wt. % of a borated polyisobutylene succinimide dispersant derived from a polyisobutylene having number average molecular weight of 350 to 5000 Daltons and a vinylidene content of at least 50 mol % in an amount to deliver at least 100 ppm of boron to the lubricating composition;
1.5 wt. % to 4 wt. % of a non-borated polyisobutylene succinimide dispersant;
a secondary zinc dialkyldithiophosphate having a mixture of C3 and C6 secondary alkyl groups in an amount to provide from 0.03 wt % to 0.05 wt % of zinc to the lubricating composition; and
0.5 wt. % to 1 wt. % of a C16-C18 dialkyl hydrogen phosphonate anti-wear additive, wherein the lubricating composition is substantially free of a metal-containing sulfur-coupled alkylphenol, and
an oxyalkylated hydrocarbyl phenol represented by formula:
wherein each R2 is independently hydrogen or a hydrocarbyl group of 1 to 6 carbon atoms;
R3 is hydrogen, a hydrocarbyl group of 1 to 24 carbon atoms, or an acyl group represented by —C(═O)R5,
R5 is a hydrocarbyl group of 1 to 24 carbon atoms;
each R4 is independently a hydrocarbyl group of 1 to 220 carbon atoms, wherein at least one R4 contains 25 to 200 carbon atoms;
n=1 to 10; and m=1 to 3;
wherein the lubricating composition contains zinc in an amount less than 600 ppm by weight of the composition.
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