Originally Posted By: Avery4
Originally Posted By: edyvw
Originally Posted By: Avery4
Originally Posted By: Danh
Mobil seems to think an 0w-20 is appropriate for any vehicle spec'd for 5w-20 and GM seems to agree. The only reason I'd hesitate is if I had a car spec'd for 5w-20 where the manufacturer had not come to this conclusion and the car was still under warranty. Ford would be one example; and even though the odds of 0w-20 causing a warranty issue are very small, why run the risk?
Thank you. So does that mean that it is at least as good?
It is definitely better in winter months!
Is it any better or worse in the summer?
No! If yu hypothetically use M1 0W20, it will provide same protetcion. W20 is what matters in the summer, 0W is what matters in the winter.
Lower first number: better cold pumpability.
Depending where you live. If you live in the Southeast, CA, TX, NM, AZ, no difference.
If you live in NY, MA, CO, MT etc, yes, there is difference.