* Maintenance: Regular maintenance, including oil changes, fluid flushes, and component replacements as needed, significantly extends a vehicle's lifespan and smooth running. A neglected 1991 Jeep will likely have issues far sooner than a well-maintained one.
* Driving habits: Aggressive driving, off-road use (especially hard off-roading), and frequent towing put more stress on the vehicle and will reduce its lifespan.
* Storage: How the Jeep was stored when not in use also impacts its condition.
* Previous repairs and accidents: A vehicle with a history of major repairs or accidents may have underlying issues that affect its long-term reliability.
* Environmental conditions: Exposure to harsh weather conditions (extreme heat, cold, salt, etc.) can accelerate wear and tear.
While some 1991 Wranglers might still run smoothly with over 200,000 miles, others might start having significant issues at far fewer miles. It's much more about the *condition* of the specific Jeep than its mileage. You'd need a thorough inspection by a mechanic to get a better estimate of a particular 1991 Wrangler's remaining smooth-running life.
