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Z Oil Change: Miles or Time?

Purist, I don't understand why you say to stick with a synthetic my next oil change as to not waste my Mobil 1. Also from what I understand Mobil 1

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Old 05-17-2012, 05:46 PM   #18 (permalink)
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Purist, I don't understand why you say to stick with a synthetic my next oil change as to not waste my Mobil 1. Also from what I understand Mobil 1 is ester based. 1. Why is 0W40 used in the gt-r if technically 5w30 is better?
2. Is it ok to go back to 5w30 after 0w40 or will it affect my engine seals?
3. Isn't the difference between the two oils that the 0w40 is better for cold starts and has a thicker viscosity at higher temps? If so why is this not preferable?
4. What does this mean? "all 0w oils lose ability at operating temperature to enable them to get down the the 0w acting?

Totally confused here

Last edited by Shamrock; 05-17-2012 at 05:51 PM.
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