Gear lubricant composition

1. A method of lubricating gearing or equipment comprising gearing comprising lubricating the parts of said gearing or equipment comprising gearing by placing the parts in contact with a lubricant composition consisting essentially of:

97 to 99.9% by weight of a trimethylolpropane triester, wherein the trimethylolpropane triester is a branched C14-C20 saturated fatty acid ester; and

0.1 to 3% by weight of at least one additive selected from the group consisting of anti-wear additives, extreme pressure additives, antioxidants, anticorrosive additives, metal deactivator additives, defoamers, and mixtures thereof;

wherein the trimethylolpropane triester is trimethylolpropane isostearate.

2. The method according to claim 1 , wherein the composition comprises:

0.1 to 1% by weight of an anti-wear additive phosphate of amine; and

0.1 to 1% by weight of a phenolic antioxidant additive.

3. The method according to claim 2 wherein the amine phosphate is an amine alkyl phosphate.

4. The method according to claim 1 , wherein the equipment comprising gearing is a stern tube.

5. A method of lubricating gearing or equipment comprising gearing comprising lubricating the parts of said gearing or equipment comprising gearing by placing the parts in contact with a lubricant composition comprising:

97 to 99.9% by weight of a trimethylolpropane isostearate; and

0.1 to 3% by weight of at least one additive selected from the group consisting of anti-wear additives, extreme pressure additives, antioxidants, anticorrosive additives, metal deactivator additives, defoamers, and mixtures thereof;

wherein the lubricant composition does not contain any unbranched or unsaturated fatty acid esters.