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Oil Viscosity for GT3 RS 4.0 engine

Ranchman 2

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I have heard a little about recommended viscosity for the 4.0 GT3 RS engine but curious to hear a bit more from others.  I understand Porsche will use Mobil 1 0w-40w on oil change.  Other I have spoken to prefer 5w- 50w.  Living in Southern Calif. I'm wonder if a 0w oil is necessary or are there other issues to consider.  Any thoughts?

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Welcome to RennTech :welcomeani:

At the risk of starting yet another "which oil is best" endless thread/argument, what you should be looking at in an oil is the level of ZDDP (and not ZDDP alternatives), shear resistance, heat transfer capability, thermal stability, film strength, and detergency; most of which is unrelated to the oil's published "X"W-whatever weights.  And as this dead horse has already been severely beaten multiple times here and elsewhere, I would suggest doing some research.

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Sorry I can't help myself but I couldn't agree more with JFP.


Mobil 1 0W-40 shears out of grade very quickly I would avoid it.  If you run this oil I would change your oil every 2K miles absolute max.


I am not an oil company direct shareholder so my advice has no bias but I have spent an embarrassing amount of time studying tribology after a timing chain failure almost bricked my engine while I was busy paying attention to other things.  I'll just be frank with you and tell you that this is the best oil you can run in the GT3 RS 4.0:


You can buy a 10-pack on Amazon for $150 and it's sold directly by Driven Oil.  Good luck and the GT3 RS 4.0 is one Hell of a car.

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