Transferring cars from gasoline to gas became popular 30 years ago, and then no one wondered whether special oils and additional additives were needed. Gasoline is a high-calorie fuel that provides maximum engine power. Gas has a lower calorific value, so the engine power per gas will be less than that of gasoline. And the temperature in the combustion chambers of gasoline and gas is different. Less gasoline, higher gasoline. This results in local overheating of valves, seats, cylinder tops and pistons. The engine oil is also heated to higher temperatures on gas. But there are also pleasant moments. Gas contains much fewer sulfur compounds than gasoline and does not contain any aromatic hydrocarbons. That is, the acids from the combustion of fuel are less and do not require oil with a high reserve of alkalinity to neutralize acidic combustion products. All these features make it possible to formulate requirements for engine oil, which is optimally suited for cars, whose engines run on