Quote:
Originally Posted by Shamrock
Purist is saying to go back to 5w30. He's saying that because he believes it's better for the z. I don't understand why it's better. I don't understand why there is less valve train noise with the 5W30. All I want is what's best for the car.
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Nissan recommends 5W-30 for the Z. Nissan recommends 0W-40 for the GT-R. The two cars aren't really in the same league, so I'm not sure why you're questioning whether 5W-30 is really better for the Z. Nissan recommends it for the car they designed and built - what more do you want? It sounds like doing the research yourself is the only way you'll be satisfied with an answer.