Lubricating composition
Lubricating composition comprising (i) base oil and (ii) a metal-free phosphonate compound having the general formula P(═O)(R 1 )(OR 2 )(OR 3 ) wherein R 1 , R 2 and R 3 are the same or different and each independently selected from a straight chain or branched, saturated or unsaturated, C 4 -C 22 alkyl group. The lubricating composition of the present invention provides improved engine durability, improved wear and friction reduction, improved fuel economy and excellent oxidative stability.
1. A lubricating composition comprising:
(i) base oil;
(ii) diamyl amyl phosphonate (DAAP) as a metal-free phosphonate compound; and
(iii) a viscosity index improver, wherein the viscosity index improver is a comb polymer having a molar degree of branching from 0.1 to 10 mol %, and wherein the lubricating composition is free of metal-containing thiophosphate compounds and wherein the lubricating composition comprises 0.08% wt % or less of phosphorus, by weight of the lubricating composition.
2. A lubricating composition comprising:
(i) base oil;
(ii) diamyl amyl phosphonate (DAAP) as a metal free phosphonate compound; and
(iii) a viscosity index improver, wherein the viscosity index improver is a comb polymer having a molar degree of branching from 0.1 to 10 mol %, wherein the lubricating composition is free of metal-containing thiophosphate compounds, and wherein the base oil comprises Fischer-Tropsch derived base oil.
3. The lubricating composition according to claim 1 wherein the lubricating composition is a passenger car motor oil.
4. The lubricating composition according to claim 1 wherein the lubricating composition is a heavy-duty diesel engine oil.
5. The lubricating composition according to claim 1 wherein the lubricating composition is a motorcycle engine oil.
6. A method comprising:
applying a lubricating oil composition to a surface in relative movement to another surface in a crankcase of an engine, wherein the lubricating oil composition comprises:
(i) base oil;
(ii) diamyl amyl phosphonate (DAAP) as a metal-free phosphonate compound; and
(iii) a viscosity index improver, wherein the viscosity index improver is a comb polymer having a molar degree of branching from 0.1 to 10 mol %, and wherein the lubricating composition is free of metal-containing thiophosphate compounds and wherein the lubricating composition comprises 0.08 wt % or less of phosphorus, by weight of the lubricating composition.
7. The lubricating composition according to claim 2 wherein the lubricating composition is a passenger car motor oil.
8. The lubricating composition according to claim 2 wherein the lubricating composition is a heavy-duty diesel engine oil.
9. The lubricating composition according to claim 2 wherein the lubricating composition is a motorcycle engine oil.