I have bougth altima 2004, Nissan recomends mineral oil can use synthetic oil
Run the synthetic oil, I would be very suprised if any real Nissan engineer would make such a statement. On the otherhand car dealerships, mechanics, and customer care lines are notoriously brainless with repect to oil. its a better oil..
That's a new one ... ain't never heard what happens to mineral oil at over 200F
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