May I ask if the turbos used in cars nowadays are driven by oil or by exhaust gas?

There are two kinds of turbocharger in cars nowadays, the original assembly is usually exhaust gas driven turbocharger, this kind of turbocharger is more effective, the disadvantage is that the turbocharger is driven by the exhaust gas, the working temperature is higher, you should make the engine idle for a period of time after high speed driving and then turn off the engine, in order to reduce the temperature of the turbocharger. There is also a power-driven, in the car is called "mushroom head", shaped like a mushroom, this is usually common in the tuning store, the effect is not as good as a turbocharger, but the technical requirements are not high.