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Explain the MRV Lab Test for Motor Oil
 
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Question:
Explain the MRV Lab Test for Motor Oil
What does MRV @ -40°C mean?
-- Steven Harlow, Hackensack, MN
Answer:
MRV @-40°C, which stands for Mini-Rotary Viscometer, is a lab test that measures the oil's ability to flow (pumpability) at -40°C. The lower the viscosity grade, the lower the temperature at which the oil will pump. For example, a 0W oil will pump at temperatures 10° colder than a 10W oil and 20° colder than a 20W oil.
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