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An internal combustion engine operating on compressed natural gas (CNG) as fuel is usually under higher thermal stress compared to the same engine using gasoline fuel. This leads to various concerns on the operation of CNG engine and the performance of the lubricant, such increased wear, accelerated total base number depletion, and faster deterioration of the lubricant. Engine oil intended for compressed natural gas (CNG)-gasoline bi-fuel passenger car application must therefore be formulated to withstand the varied and often severe operating conditions, as well as maintain superior lubrication control and prolong engine life. PTT Public Company Limited (PTT) has developed a new CNG-gasoline lubricant meeting API SN/GF-5 performance category that is able to address the various operating concerns of bi-fuel passenger car engines, and at the same time provides extended oil drain interval (ODI) capability.

This study describes the development of engine test applicable to motorcycles. Due to the dramatically stringent of emission regulation, the aim of this development is to develop the engine test specifically for motorcycles based on the unconventional fuel, of which test results is comparable to field trial test results. Furthermore, this developed engine test is able to distinguish the engine oil in each performance level. Resulting in this comparison the newly development of engine test is comparable to field trial in aspects of detergency, anti-wear performance, and oil consumption.