I have a 1998 Durango with 85000 miles on it. This is my first oil change since buying it. I'm pretty sure it has only had dino oil in it so I think that is what I will keep using. I am thinking about the high mileage formula oils. Which company makes the best one? I picked up some penzoil 10 30 but I will return it to wal mart if there is a better choice. Also, I have always used fram filters but will consider a change. What about the double guard fram, is it better? My other car is my wifes 2003 neon. Ot has less than 3000 miles and we will probably be doing our own changes on it also. I plan on doing oil and filter changes every 3000 miles so I think I will use dino oil. I need opinions on which dino oil is the best for my high mileage car and new car. Also opinions on filters. Sorry for the long post and thank you.