Gasoline engine and diesel engine fuel used in different, they have different characteristics. Therefore, the performance of different engines require them to use the appropriate oil.

It is particularly important for gasoline engines to remove cleaning devices (removing residual particulates such as sludge to keep the interior of the engine clean) and camshaft wear protection. Further, the gasoline engine is equipped with a series of catalysts to purify the exhaust gas, and its oil composition is also necessary to prevent reaction. The diesel engine is different, it will produce more soot, so the crucial factor is to control the production of soot. It is also important to add acid-resistant ingredients to neutralize the acid that is produced by burning sulfur in diesel fuel. As a special type of emissions, manufacturers often have to install emission control equipment in the engine, such equipment requires high-performance oil.

Therefore, it is unwise to use gasoline engine oil in a diesel engine. Petrol engine oil performance rating by the letter "S" (spark ignition), such as SL, SJ and so on. The diesel engine oil from the "C" at the beginning, such as CF, CD and so on. So it's easy to distinguish between them. Gasoline / diesel dual-use oil is constructed from two different engines and can be used with either engine depending on the conditions of use. Its rating is [SJ / CF].