Patent ID: 9738849
Date: 2017-08-22
CPC Classifications: C10M,C10N

Claim:
1. A lubricating composition comprising (a) an oil of lubricating viscosity, (b) 0.5 wt % to 1.0 wt % of a phosphite having at least one hydrocarbyl group that has 4 or more carbon atoms, wherein the phosphite having at least one hydrocarbyl group with 4 or more is represented by the formula: wherein at least one of R (c) 0.1 wt % to 0.5 wt % of a compound derived from an ester of a hydroxy-carboxylic acid having linear or branched alkyl groups of 1 to 20 carbon atoms and selected from the group consisting of malic acid, citric acid, or mixtures thereof; and (d) an overbased magnesium sulphonate detergent having a TBN of from 250 to 600 present in an amount from about 0.2 wt % to about 8 wt %; wherein the lubricating composition is characterised as having (i) a sulphur content of 0.5 wt % or less, (ii) a phosphorus content of 0.1 wt % or less, and (iii) a sulphated ash content of 1.5 wt % or less.