I do not want this to turn into yet another oil debate…just want to share my experience…
2003 Explorer Eddie Bauer with the 4.6L V8, 173,000 miles on the odometer, original trans and engine…it’s had regular oil changes, but at least the last one was done at a quick-lube place, they used Valvoline oil, probably a synth blend…5-20W…anyway, since we’ve owned it (we’re about 5,000 miles into it), the engine has always sounded a little clatterey or rattley. Hard to explain. I was worried it was cam chain issues but the noise wasn’t audible from the front, and I couldn’t really even hear it at the top of the motor. I could only really hear it in the cabin and particularly under load. I assumed it was just normal although my ‘01 Mustang doesn’t sound like that…although the supercharger and performance exhaust might drown it out. So I just assumed it was normal noise or maybe normal for a motor that’s getting long in the tooth. Changed my oil yesterday and filter. I always get the Motorcraft filters. By the way it was literally double the size of the Valvoline filter the quick lube place installed. Geez. Well, I used Motorcraft full synthetic 5-20W…clatterey noise gone…totally gone. I suspect it was valve train. Throttle response significantly improved. And don’t get me wrong, the Explorer has plenty of get-up-and-go but this was like “woah”, big difference. I bet we’ll pick up another 1-2 mpg average which EASILY pays for the cost difference on the more expensive oil. Just wanted to share my experience. This is the oil I put in:
https://www.oreillyauto.com/detail/...suv-2003-ford-explorer?q=Motorcraft+oil&pos=3