What brand of gasoline engine oil is good and cost-effective?

The most mainstream is the "two barrels of oil" engine oil brand, namely Kunlun under PetroChina and Great Wall under Sinopec. This is the most common domestic independent engine oil.

Then Longpan Engine Oil, as a listed company, is also a giant. Regardless of output and enterprise scale. It is also a relatively mainstream regular brand.

Of course, there are many domestic engine oil brands, such as Ogina of Tianjin FAW, Unification of Shell's annexation, Compton of Antarctic scientific research and so on.