When I bought my Cherokee, that was what had been run through it was Mobil 1. I swore on synthetic. Yes, I could have paid $3 USD/quart for regular oil, but I preferred the $8/quart. My truck ran fine until I switched. Normally, I get 19/22 with my Cherokee. My MPG didn't really change, but as the years wore on, the engine performance suffered. Synthetic is exactly that, synthetic, whereas, motor oil that is a derivative of crude oil, has certain detergents and additives formulated for certain engines and operating conditions. I like synthetic, simply because it does not break down near as fast, and still protects critical engine parts. The downside is, people are already lazy about keeping up with regular maintenance, and they think that with synthetic, they don't have to worry as often (the recent Ford commercials where they go around the world on one oil change doesn't help in changing the mentality).
Truth is, automakers are extending the time between oil changes and lengthening their warranty periods and maintenance schedules, but one still needs to be vigilant with their vehicle, as it is an investment, and like someone here already said, I keep my vehicles for 10+ years, and in order to make that happen, one has to keep their vehicle up. After all, it's a Jeep, so why wouldn't you???
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My 2007 Jeep Compass Sport, Bright Silver Metallic, 26E, CVT II, Driver Convenience Group, Sunroof, Trailer Tow Prep Group, 4x2
1991 XJ Cherokee Sport 4X4 4.0 H/O I6
2008 Dodge Ram 1500 ST, SWB Reg Cab, Bright Silver Metallic, Trailer Tow Package
JEEP - Just Enjoy Everything, Period.....