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I have a 2002 Jeep Grand Cherokee with 225,000 miles. I have the 4.0 liter straight six engine.
All the old beat to shit Jeeps you see on the road (even the old square body Cherokees) have that straight six engine. That engine design goes all the was back to the original Hudson Hornet automobile. Except now, they're fuel injected.
Jeeps are hard on batteries, brakes and are prone to electrical issues. I've replaced three of the four power window motors, had problems with the instrument cluster for windows and mirrors on the driver door, had to put in a new seat -the power seat frame is notorious for breaking, bad welds. But the power train has been great, and haven't had any spots on the body rust through.
Gas mileage on a six is actually just a couple miles better than a V8, but the engine is much more reliable and easier to work on.
Unless you plan to tow something, you really don't need the V8.
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