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I have a 2010 Fusion with the 2.5L I-4 with 91k miles. The engine notoriously has a noisy valvetrain, and that is not what I am concerned about. I drove the car only twice in the last two weeks, both times startup was after a week of not running and temps were about 25F. Upon startup, I had a...

I was wondering if anyone has more info on this topic. It seems the new low emissions stuff isn't holding up as well as the previous spec. My dad drives truck for a certain large shipping company with brown trucks.. They use Delo 400 in all their trucks and do the 15 gallon oil change every 20k...

Spec oil for the engine is 5w-30 with 10w-30 listed for warmer climates. The engine has 160k miles and isn't as smooth sounding as it used to be. I've been running Walmart's SuperTech 10w-30 high mileage formula for the past 50k miles and wondering if it would hurt anything to use Rotella-T...