| 摘要 |
<p>Provided is a continuously variable transmission oil composition that can markedly increase the coefficient of friction between a metal belt or a chain and a pulley, that can maintain the high coefficient of friction over a long period of time, and that causes no clogging of the clutch plate. The continuously variable transmission oil composition includes 0.005-0.15 mass%, as phosphorous compound-derived phosphorus content with respect to the total amount of the composition, of at least one type of phosphorous compound represented by general formula (1) in a lubricating oil base. (1) In general formula (1), R 1 , R 2 , R 3 and R 4 each represents a hydrocarbyl with carbon number 1-30 or a hydrogen atom, R 5 represents a hydrocarbylene group with carbon number 1-30, X 1 and X 2 represent an oxygen atom or a sulfur atom, and n represents an integer 1-10.</p> |
