Any reason NOT to run 0w20?

[bigt61]

Originally Posted By: ThirdeYe
Do any GM cars even specify 0W-20? Perhaps that's the reason why Shell decided not to certify those oils. I believe the 5W-20 that I bought at the same time did have "Dexos" labeled on the front of the bottle.

New GM V8 trucks take 0W-20 Dexos - that's a huge market all by itself.

 

[fdcg27]

This sounds like a good plan for winter that may do some good and won't do any harm.
Any 0W-20 you can buy at Walmart would be a no-risk replacement for 5W-20.
This might not be true of the very high VI Japanese 0W-20s.

 

[raytseng]

Would agree that out of the bottle should work just fine.

But potentially at end of life of the oil, the 0w-20 will be sheared closer to it's lower rating compared to the 5w-20.

So it may matter only if you're extending out your oil changes really far (see guy who doesn't change his oil at all, or toiletpaper filter kooks).