I use Royal Purple in everything I own. Filters, I use Bosch in my YJ and S-10, Mopar in my Intrepids. With the prices rising so much (Royal Purple and Edge are about the same price around here $8.70 a Qt.) I am looking into using something else. I have heard that Valvoline synthetic is pretty good. I will stick to a synthetic, no dino stuff, better all the way around. As much money that we have in our vehicles, the high cost of synthetics and any maintenance for that matter, is still pretty cheap. If it will make it run better and last longer and make you feel better about yourself, it's worth it.
Glenn