railway RRB JE (CBT I + CBT II) Mock Test 2024 Internal Combustion Engine Fuels and Combustion

In a normally operating diesel engine the main source of lubricating oil contamination in the crank case is a result of the

1
Metal particles loosened by wear
2
Condensation of water vapours
3
Break down of the lubricating oil itself
4
Fuel dilution
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