In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.<br>A:metal particles loosened by wear<br>B:air when no air cleaners are used<br>C:condensation of water vapors<br>D:breakdown of the lubricating oil by dilution

In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
A:metal particles loosened by wear
B:air when no air cleaners are used
C:condensation of water vapors
D:breakdown of the lubricating oil by dilution

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