I changed the oil in mine & the wifes cars a few days ago.Walmart had the Mobil1 5w-30 EP for $26 for a 5qt jug so I thought I'd try it out. The vehicles: 2002m Mustang GT w/ 89k miles Several mods & run hard on a daily basis. Using regulat M1 5w-30 with FL820S filter changing every 3-4K. Had quite a bit of valvetrain noise as most of the 4.6's do. 2003 Honda Accord w/ 58k miles Bone stock Using Motorcraft 5w-30 blend with Pure One filter changing about every 3-4k unless the wife forgets to tell me she's hit mileage. I've come to learn since we got married last year that she pays absolutely no attention to the change sticker I put on the window for her, LOL. I now pay much closer attention. The valvetrain was a little noisy in her car also. Switched to the 5w-30 EP with the FL820S in my car and the valvetrain noise has almost completely disappeared. Put the same oil in her car with a Fram TG filter and the same thing. Almost all valvtrain noise is gone. YES, I know, FRAM sux, I agree. But that was the only filter for her car that Walmart carried. There were only MC & Fram on the shelves. I went yesterday and stocked up on some MC and Pure One filters. I figure using the fram for one interval isn't going to kill anything. So for $5.20 a qt. in the 5qt jug theM1 5w-30 EP is working great so far. And both engines run smoother as well as being quieter. I figured I'd post this up in case anyone was thinking of trying this oils out. I'll update with a post later on if the valvetrain noise starts to come back.