Question 1072 Deck Safety

70% to pass

Lubricating oil should be changed on a heavy duty diesel engine when _______________.

A it has been in use for a specified interval
B it gets dark in color
C it no longer supports combustion
D a sample rubbed between fingers feels thin
AI Explanation

The correct answer is A) it has been in use for a specified interval. Lubricating oil in a heavy duty diesel engine should be changed at regular intervals specified by the engine manufacturer, regardless of the oil's color or viscosity. This is because the oil breaks down over time and use, even if it doesn't appear visually dirty or thin. Following the manufacturer's recommended oil change schedule is the best way to ensure proper lubrication and engine protection. The other options (B, C, and D) are not reliable indicators for when to change the oil, as the oil's condition can deteriorate before noticeable changes in color or feel.

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46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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