I am actually looking to buy a new JKUR soon as well, and in my experience with new synthetic oils, they will last 10K before starting to break down, some are 15K. Most people would run oil changes every 7500 with synthetic, but thats up to you. My brother had an M5 before and they would run oil samples to find the state of the oil before changing. He had about 75K on his car with only 3 oil changes on it, but that route is too expensive for your standard maintenance schedule. If it were me I would feel safe to change my oil anywhere between 7500 and 10000. thats my .02 :thumb: