I just got finished thoroughly inspecting the underside of both my cars engines. They both clearly have oil seepage around the oil pan gaskets, but not severe. One car, it's "almost" dry. The other one, a bit more moisture around it. I think I'm going to take the plunge and try synthetic against some adive I've gotten to change the gaskets first. Why? Because, it is simply an oil pan gasket, that if I wanted to, I could simply change myself, but I'd rather try the synthetic first and see if I really need to after a few OCI's with the synthetic. Then if it does get worse, simply replace the gaskets, and problem solved. I do say I've made up my mind, but if any of you have any compelling advice, I'm still listening. The Chevy Lumina with 130k sits a lot. I put 5-7k a year on it, and I would like a better oil in as I plan to keep this car 70 more years (LOL). The minvan with 68k, it's the family mobile, and gets a lot of short trips, I want its engine to have more protectin than the conventional can offer.