Thread: Using 5W-40 on Z's with no oil cooler
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Old 07-24-2010, 12:17 AM   #2 (permalink)
gumpy
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Quote:
Originally Posted by Zeto View Post
I received advice from a tuning shop to run 5W-40 oil as opposed to the 5W-30 since I don't have an oil cooler. They said the heavier will absorb the heat better and the heat will break down the 5W-40 viscosity to a lower weight. Is there any truth in this?
yes and no

Yes a w40 oil will be thicker at higher temperatures and protect better...

No 5w30 is fine for normal driving.
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