A HIGH PERFORMANCE GEARBOX LUBRICANT WITH ENHANCED DRAIN INTERVAL FOR HEAVY DUTY COMMERCIAL VEHICLES AND A PROCESS FOR PRODUCING THE SAME

摘要

The invention discloses a high performance gearbox lubricant oil for heavy duty commercial vehicles, typically buses with city stop-and-go operations. The invented lubricant is an oil composition made from two base oils and a set of additive combination. One base oil is a paraffinic base oil belonging to API GP-I category having viscosity of 27-34 cSt at 100 °C, and the second base oil is highly paraffinic API Gp-II base oil having a viscosity range of 8-12 cSt. This oil composition has a drain interval of about 80,000 kms, which is double the drain interval of conventional oils for similar applications. In and after use, the lubricant retains its viscosity in the SAE 80W-90 grade, which is same as that of fresh lubricant. The lubricant is compatible with other sources of oils meant for similar applications to eliminate separation and sedimentation of additives in case of a mix up. A process for producing this lubricant is also disclosed. The process comprises of mechanical stirring and controlled heating while mixing the additives with the base oils.