I haven't had a vehicle that's used a cartridge type oil filter in probably 50 years. I just bought a 2015 Jeep Wrangler JK. For the JK 3.6 liter engine I've read that Mopar is good but I want better than just good. I plan on keeping my Jeep for a long time. I got the service records from the previous owner and they changed the oil at recommended intervals at the local Jeep dealer. I plan on switching to Pennzoil platinum full synthetic at the next change. I've used Mobil 1 filters on all my other vehicles with spin on filters. I was going to go with M1 for the JK but I've been reading a lot about the Fram Ultra synthetic oil filters. Apparently they filter better than M1. Cost isn't an issue. I don't mind spending a couple dollars more if I can get a better filter. Has anyone had any experience, problems or issues with the Fram Ultrain a Jeep? How about M1? Thanks