Using 5W-40 on Z's with no oil cooler

Originally Posted by Zeto 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

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Using 5W-40 on Z's with no oil cooler

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07-24-2010, 12:17 AM

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gumpy

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Join Date: Oct 2009

Location: Sydney

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Drives: 09 370z white manual

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Quote:

Originally Posted by Zeto

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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