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What does the number before the W mean in 15W40 multigrade oil?
Wiki User
∙ 10y ago
"winter"
The oil will act like 15 weight oil in cold weather and 40 weight oil in warm weather.
Wiki User
∙ 10y ago
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What does 15w40 mean?
-15 degrees in the winter and 140 degrees in the summer its the measere of temp the oil is made to with stand the w stands for winter
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