I've used M1 5W-20 for my Hemi ever since I bought the Jeep at 9k mi. I'm at almost 112k now. No oiling issues. I also use the Mopar filter since I can get it at Walmart along with my 5qt jug of M1. I'm also partial to the Napa Gold (otherwise known as Wix) filters. I've heard horror stories about Fram stuff.