Engine_2014 : Motor Plants and Auxiliary Boilers - 594/2614
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| In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the __________ . |
| A) metal particles loosened by wear |
| B) trapped air when no air cleaners are used |
| C) condensation of fuel oil vapors |
| D) combustion byproducts removed from the cylinder walls |
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