| abstract |
PROBLEM TO BE SOLVED: To provide a transmission fluid exhibiting a high steel-to-steel friction coefficient. SOLUTION: One of zinc and the following acidic substances (or mixtures thereof) that are oil-soluble, neutral or overbased in a base oil: sulfonic acid, carboxylic acid, salicylic acid, alkylphenol and sulfurized alkylphenol. It contains a zinc detergent and a phosphate, an acid phosphate, a phosphite, an acid phosphite, an amine salt of the ester and a phosphorus-containing dispersant which is a salt of the above. A fluid composition for a transmission, comprising an additive. |