Low zinc lubricant composition

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.