I currently run 2 vehicles with fram filters. A 2006 chrysler town and country 3.3 v6 and a 1996 dodge ram 1500 5.2 v8. They both are ran on castrol gtx high mileage. I ususally keep the oci on the van between 5-8000 miles and try to stay at 5000 with the truck. I change the filter every other change. I use the xtended guard on the van and tough guard on the truck. But recently I've heard from a few buddies and been reading through the fourms and I've heard good things about purolators. I was just wondering what's the best for my situation?