Question 44General Subjects - QMED

70% to pass

If an engine lubricating oils viscosity is given as 20W-50, what does this mean?

AThe oil is formulated to meet the low temperature requirements of SAE 20W oil and the 100oC (high) temperature requirements of SAE 50 oil and as such is a year-round oil.
BThe oil is formulated to meet the 100oC (high) temperature requirements of SAE 20W oil and the low temperature requirements of SAE 50 oil and as such is a year-round oil.
CThe oil is a mixture of equal amounts of SAE 20W and SAE 50 oil and as such is a year-round oil.
DThe oil is a mixture of equal amounts of SAE 20W and SAE 50W oil and as such is a year- round oil.
AI Explanation

The correct answer is A) The oil is formulated to meet the low temperature requirements of SAE 20W oil and the 100oC (high) temperature requirements of SAE 50 oil and as such is a year-round oil. This is correct because the 20W-50 designation indicates that the oil meets the low temperature viscosity requirements of an SAE 20W oil (for cold weather) and the high temperature viscosity requirements of an SAE 50 oil (for hot weather), making it suitable for use year-round. The other options are incorrect because B) is the reverse of the actual meaning, C) indicates a simple blend of two different oils, and D) refers to a different oil viscosity designation (20W-50W).

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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