I know this is going to sound stupid, but what is SOPUS? On the bottle it says it is for, trucks, suvs, and minivans. Just curious. Thanks so far for your responses.
There is a lot more here than price. The motorcraft for the price is great. But it's only a blend do to SM specs. For most applications it will hold up fine. But you can run the QuakerState for an longer OCI. It's additive pack is a lot better. And as stated before it High Temp performance is better.