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

Running one grade higher or lower in reality won't hurt anything. The _W number will make the most noticeable difference for cold weather. Oil is designed to be at around

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Old 05-14-2021, 05:46 AM   #18 (permalink)
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Running one grade higher or lower in reality won't hurt anything. The _W number will make the most noticeable difference for cold weather.

Oil is designed to be at around 212F or 100C regularly. If you run a 40grade oil instead of a 30grade the temps need to be at around 239F or 115C regularly to achieve the same viscosity. Question is why would you want to run at higher temps regularly, heat makes everything worse in an engine.


I did switch to 5W-40 right before track events and change it out after.
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