Correct answer
the same oil used by the engine.
The oil that lubricates the turbocharger mechanism of a bus is the same oil used by the engine and is essential for maintaining the correct temperature while the engine is running.
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the same oil used by the engine.
high-viscosity oil (gear oil), so that it can withstand its operating temperature.
low-viscosity oil, given the high number of revolutions per minute it reaches during operation.
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