Z Oil Change: Miles or Time?

370Z Purist

Shamrock, you've completely hijacked the thread, and I don't see why you still post on this thread when you've got your own specific one for your specific question.

Unless you care to do the research like many others have, anything that anyone might tell you could be true or false, and either way, if you don't understand what they're saying, you don't learn anything anyway. You might even learn the wrong thing.

Here's what I can tell you.

0W40 is thinner at cold temperature, and thicker at operating temperature. This is only in comparison to 5W30, which is a bit thicker at cold temperatures and thinner at operating temperature. I recommend running a generally thinner oil since it has to do with how motors are manufactured and how the Z typically runs a hotter oil temp and various other miscellaneous factors that would be lost on laymen such as us. I'm not even sure if I'm completely correct in saying that. Hence, I would recommend 5W30 Nissan Ester Oil, as it is the factory fill, is not some cheap dino or baseline synthetic that comes on a Camry or similar, and because as far as I know, the oil was specifically created for use in the 370Z. Forum members have also noticed a much quieter valvetrain, and for that reason, is good incentive to go with the OEM fill. After all, why would the manufacturer recommend a specific oil or even a specific oil weight if there was no reasoning behind it?

Mobil 1 is not ester, period. I stated this in your thread.

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-Phil

"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."