Quote:
Originally Posted by ncs
It really depends on your oil pressure. If you want to know for certain, get a gage. The generally acceptable minimum is 10 psi per 1000 rpm, with idle around 20.
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I think this is a good way to determine your oil viscosity needs when deviating from the OEM recommendation.
Mobil1 0W-20 and 0W-30 state that they provide the same protection and warranty coverage as 5W- oils while giving up to a 2% increase in mileage.
Especially if it gets very cold where you live, a 0W oil is an advantage as far as engine wear at start-up goes and it may give you slightly better mileage.
My last oil change before winter is always synthetic 0W.