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

brainrain · 05-15-2021, 02:01 PM

Quote:

Originally Posted by 2011 Nismo#91

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.

I live in Paris. Winter is not a problem because it never gets below -5C (40F). I think 5WXX oil is ok for me.
The problem it's when my engine is hot. Engine oil is often at 110-115 degrees in traffic or sporty driving. I often drive on roads without speed limits (at germany

).

This is why I would like to know if it is good for engine to drive with 5w40 oil throughout the year.

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