| abstract |
A lubricating composition comprises a base oil, a friction modifier and a dispersant, wherein the lubricating composition has less than about 325 ppm of boron. The dispersant may comprise a basic nitrogen or it may be a polyisobutylene-based dispersant. The friction modifier may be a non-nitrogen-containing compound, a nitrogen-containing compound or an ash-containing compound. The nitrogen-containing compound may be a long chain alkylene amine or diethanolamine. The ash-containing compound may be a molybdenum compound, a titanium compound or a tungsten compound. The composition can reduce boundary friction and improve fuel economy in automotive engines. |