[tardboi]

Originally Posted by F32Fleet

In real world not really. If you look at the viscosity charts you'll see that both trend extremely close once they reach 20C(68F).

https://wiki.anton-paar.com/us-en/engine-oil/

Thanks, I was looking for something like that. Looks like the 5w-40 "needs" about 8c(~15f) more to match the viscosity of the 0w-30.