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

Nissan (and all other car makers) engineers spend at least a little bit of time and money figuring out which oil viz works best in each engine. Plus they have

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Old 05-15-2021, 04:05 PM   #1 (permalink)
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Nissan (and all other car makers) engineers spend at least a little bit of time and money figuring out which oil viz works best in each engine. Plus they have a lot of experience. And engines are a LOT pickier than they were back in The Good Old Days of iron blocks and carburetors. I'll go with what they recommend.

But, as mentioned above, a few cSt here or there on the W end isn't going to make that much difference. But you can go too far.
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