Quote:
Originally Posted by rj45
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.
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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.