Quote:
Originally Posted by Shamrock
1. Why is 0W40 used in the gt-r if technically 5w30 is better?
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I didn't see anyone state that 5W-30 is better than the 0W-40. And I certainly didn't see anyone state that 5W-30 is better for the GT-R.
Quote:
Originally Posted by Shamrock
2. Is it ok to go back to 5w30 after 0w40 or will it affect my engine seals?
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It's fine - it won't affect your seals.
Quote:
Originally Posted by Shamrock
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?
Totally confused here
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Bob the Oil Guy is a wonderful resource to better understand these differences.