A sudden decrease in the diesel engine lube...

Question 1 / 205eccefa2bacbc34ba4d47914

Question 1 of 205eccefa2bacbc34ba4d47914

A sudden decrease in the diesel engine lube oil viscosity could be an indication of __________.

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Question 1 of 20

5eccefa2bacbc34ba4d47914

A sudden decrease in the diesel engine lube oil viscosity could be an indication of __________.

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🔍 Key Concepts

• Viscosity and what it means for lube oil thickness/flow • Common causes of lube oil viscosity increasing versus decreasing • How fuel dilution or contamination affects lube oil properties

💭 Think About

• Ask yourself: which choice would make the oil thinner and more "watery," not thicker? • Which options would normally lead to more solids or heavier molecules in the oil, and would that raise or lower viscosity? • Think about what happens to lube oil if unburned fuel leaks past the piston rings into the crankcase.

✅ Before You Answer

• Be clear on the difference between loss of additives and contamination of the oil. • Consider whether carbon deposits would logically make oil thicker or thinner. • Think about whether centrifuging removes or adds anything that would change viscosity suddenly.

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Question 1 of 20

A sudden decrease in the diesel engine lube oil viscosity could be an indication of __________.

loss of additives from the lube oil

carbon deposits in the lube oil

excessive centrifuging

excessive fuel dilution

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