I started using this in my Jeep 5000 miles ago, have changed it once, and I have nothing but good things to say. It has better reviews than all other oils, is the purest synthetic on the market, and is statistically better than any on he market. I've noticed a huge difference from the Castrol oil I was using-which in a jeep is a big feat because you can feel the engine and transmission through the shifter. Since its a new(ish) vehicle-it's hard to review any long term effects, but I know mopar recommends pennzoil synthetics in their motors, and I haven't noticed any wear or lagging. Since I work on all my vehicles I'm pretty stingy on what I put in them, and I can honestly say I rest easy knowing I'm putting this platinum ultra in my car. More expensive, but worth it in my humble opinion, especially if you plan on keeping your vehicle for a long time.