OIL WEIGHT
Both these oils will be 40 weight oils at operating temperature or about 15-17 cSt (centistrokes) at 200 degrees. At 50 degrees, both the 5w and the 10w will be much thicker. The 5w will be around 280 cSt and the 10w will be about 460 cSt." the way i was told that an oil that. say 5w 30 is that when the oil is cold.
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