The 1988 Jeep Wagoneer came with the option of a 5.9-liter V8 or a 4.0-liter straight 6 engine. The 4WD off-roading monster comes with two transmission options as well, a 3-speed or a 4-speed automatic, depending on what you need the Wagoneer for. Ideally, gas mileage is around 18/23mpg, but it doesn't often get those numbers, especially not in the V8. 4WD is, after all, a gas hog. Either one of these engines packs a lot of punch and power, making this a formidable vehicle. Its long, powerful history made sure of that. Speaking of the history behind the 1988 Jeep Wagoneer, very few mechanical changes were made to this line over its 28 year reign, so many parts from both older and newer years fit this year model. This makes the 1988 Jeep Wagoneer an ideal fixer-upper or upgradeable car, and indeed, many people and groups are dedicated to upgrading. So if you want more comforts than air conditioning, cruise control, power windows, power locks, and a moonroof in your 1988 Jeep Wagoneer, upgrading isn't too hard, and many companies make parts specifically for the Wagoneer. Owners of the 1988 Jeep Wagoneer love this SUV. It has been hailed as a rugged off-road monster, but also as a family-friendly, comfortable car that makes everyone feel safe inside a solid metal frame. There were a few minor problems, some people wishing for disc brakes instead of drums, but overall, this was a well thought of car. As I've said, many people upgrade and enhance the 1988 Jeep Wagoneer to make it even more powerful or rugged, but straight off the line, this is a great SUV, at least according to owners.