What is a typical consequence of oil-system contamination?

• A. Improved lubrication.
• B. Filter life extended.
• C. Bearing damage due to reduced lubrication and filter plugging.
• D. Oil temperature decreases.

Answer: (C)

Oil-system contamination introduces particles and debris into the lubrication path, which disrupts the formation of a stable lubricating film and can clog filters. When the film protecting moving surfaces is compromised, there’s increased metal-to-metal contact, leading to accelerated wear and heat. This is why bearing damage is the typical consequence: reduced lubrication plus potential filter plugging starves bearings and other components of clean oil.

Options suggesting improved lubrication or extended filter life don’t fit because contamination degrades lubrication quality and accelerates filter clogging, and it can raise oil temperature rather than decrease it.