Abstract
The article aims at the engine oil acid and base value of Shenzhen LNG bus. We sample the vehicle new and replaced oil，test the quality indicators in determining the parameters of the engine oil，analyze the engine oil,s decreased rate of base value and acid value increment for determining the engine oil drain interval. In this paper, alkaline additives, impact on the performance of lubricating oil can be verified through a trial basis, and come to the actual lubricating oil using recommendations.
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