General Studies · IC Engine Lubrication System
Which combination of factors is primarily responsible for the formation of black sludge in internal combustion engine oils?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Hydraulic fluid contamination and copper corrosion
- 2Ambient atmospheric air and nitrogen gas interaction
- 3Water condensation, soot/carbon, and oil oxidation products✓
- 4Pure unrefined mineral oil base
Correct answer
Water condensation, soot/carbon, and oil oxidation products
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