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Old 08-31-2010, 01:23 PM   #34 (permalink)
ImportConvert
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Quote:
Originally Posted by rj45 View Post
This is my understanding of engine oil weights. Someone correct me if I'm wrong.

Regular oil: for example, 5w-30...is a 5 weight oil that thickens to a 30 weight when it gets hot.

Synthetic oil: for example, 0w-40...is a 40 weight oil that flows like a 0 weight oil when it's cold.
No.

Oil doesn't thicken when it gets hot.

Do what I said and disregard those BIG numbers and flip the bottle around or get online and look up the numbers as "cSt at 40*C and cSt at 100*C" and you will get a MUCH more accurate picture of the viscosity of your oil at cranking and operating temps.
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