PETRONAS Urania Prime Classic 10W is a monograde heavy duty diesel engine oil, formulated for older commercial vehicle applications and high-revolution turbocharged diesel engines for both on-highway and offhighway, where API CF is recommended, to help control against wear and control corrosion. Suitable for use in hydraulic systems, transmissions, differentials or final drives in equipment where CAT TO-2 fluid or API CF (or lower) SAE 10W engine oil is required.