Going back to 0w-20 for the winter

[oil pan 4]

I'm an hour and half, give or take from you and originally from Flat Rock, so essentially the same weather. I probably take the same I75 route that you do as well going to FL. I'm doing something similar but am running 5w20 from June through Oct and switching back to 0w for the winter. I know, I know, 5weight will start at -40 and all that. I can still tell a big difference between a 0 and a 5 at minus 10.

I go by a jeep service bulletin that boiled down to make sure you don't use oil that gets thicker than 6,000cP at your coldest temperature expectations.
That's probably around -20f here. If it gets that cold I'm not going anywhere except to the wood pile with my wagon

There is a GREAT Ford video on YouTube where they ran a turbo ecoboost truck towing a trailer around a super speedway ( maybe Daytona?) at full throttle for like 24 hours straight. The turbos were glowing the entire time. In the crankcase? Regular motorcraft semi synthetic 5W20. No issues, no damage. Oil handled it just fine.

Yeah 20wt works great, till it doesn't.

 

[oil pan 4]

It's not the oil that's the issue-it's engineering defects in the motor. It's not a "fix"-simply a band aid.
https://gmauthority.com/blog/2025/0...all-doesnt-apply-to-2025-model-year-vehicles/

Then it's funny how 40wt is good enough but 20wt isn't. Like I said earlier, 20wt is good enough till it isn't.

 

[oil pan 4]

Correct, but what was their first move? Removing the 20w. That speaks volumes to me.

Aye

 

[CKN]

Then it's funny how 40wt is good enough but 20wt isn't. Like I said earlier, 20wt is good enough till it isn't.

There are far too many vehicles on the road running 0w/20 for a statement like that. I understand its an " old school club" on here.