| abstract |
PF2017M002/FF - 41 IMPROVEMENTS IN AND RELATING TO LUBRICATING COMPOSITIONS 5 A lubricating oil composition, a method of reducing low-speed pre-ignition (LSPI) in a direct-injected spark-ignited internal combustion engine, and a use of a lubricant composition to reduce LSPI events in such an engine. Preferably, the composition comprises a detergent package comprising a borated calcium detergent, wherein the detergent package provides a calcium content in the composition of at 10 least 0.12 wt%, based on the weight of the composition, and wherein the borated calcium detergent provides a boron content in the composition of at least 100 ppmw, based on the weight of the composition. Optionally, the composition comprises a first detergent comprising a calcium detergent, and a second detergent comprising a borated calcium detergent. |