Why Is There Engine Oil Inside the Turbocharger?

1 Answers
DelHector
07/30/25 8:05am
Turbochargers must have engine oil to lubricate the rotor. The rotor operates at high temperatures and extremely fast speeds; without oil, it would seize and stop rotating. The following explains why turbochargers draw engine oil from the engine: Insufficient Lubrication: During normal diesel engine operation, the turbocharger operates at extremely high speeds and temperatures. If the engine is shut off directly, the oil pump will stop working immediately, while the turbocharger undergoes a gradual slowdown. This results in semi-dry friction between the center housing and rotor shaft, which can easily lead to early signs of wear in the turbocharger. This, in turn, damages the rotor shaft and oil seals, causing the turbocharger to leak oil. Dirty Engine Oil: If the oil contains excessive impurities, the hard particles can scratch the housing and sealing rings, leading to premature damage of the turbocharger.
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