What oil should be used to top up oil in a bus engine?

Explanation

Correct answer: Oil of the same class as the oil in the engine.

Mixing engine oils of different quality or viscosity grades is inadvisable, as this can negatively affect their lubricating and protective properties. To top up the oil level, always use a product with the same specification as that currently in use and which is in accordance with the vehicle manufacturer's recommendations, to ensure the proper operation and lifespan of the engine.

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