Which risk increases when unburnt fuel/air mixture bypasses piston rings into the crankcase?

💡 Explanation

When unburnt fuel/air blow-by occurs because of worn or damaged piston rings, fuel enters the crankcase diluting the lubricating oil, reducing its effectiveness in protecting bearings. Therefore oil dilution and bearing failure are increased, rather than backpressure, gasket erosion, or turbocharger issues which require different failure mechanisms.

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