I purchased my 1999 Isuzu Trooper used in 2000. I still own it sixteen years later, with more than 100,000 miles in addition to the miles that were on it when I bought it. It has been, bar none, the most reliable vehicle I have ever owned. It still has the entire original exhaust system. I changed oil every 3,333 miles and changed the tranny fluid several times (towed with it a lot), which I credit for having avoided the engine and tranny problems that others have experienced. I kept sheepskins on the front seats from the time I bought it so the seat fabric is like new. It has also been garaged the whole time, so the paint is in great shape too. Years of life left in it.
I purchased my Trooper with 72,000 miles on it and immediately had the transmission flushed and service. Throughout its life I changed oil every 3,000 miles and used Valvoline Max Life. I blew the tranny at about 135,000 miles, and I'm not sure why. I took very good care of the vehicle. Besides that, I had a lot of problems with the vacuum 4 wheel drive system, which cost me a lot of money. The AC also went out at 85,000 miles. When the tranny went out the rear struts were shot and the exhaust system had a big hole in it just behind the caddy. Since Isuzu discontinued their automotive line, part prices have gone up significantly.
We have had no problems with this vehicle and have nearly 45k on the odometer. The vehicle is built solid, has no rattles, has exceptional visibility, enough power, and excellent brakes. The brakes should easily reach over 75k based on an inspection at 40k..Fuel mileage averages 17 mpg. This vehicle can go places in 2wd that most of it's competition can only traverse in 4wd.I expect 200k out of this vehicle without any replacement of the powertrain.
Bought this 99' black beauty OOPER back in 08'. Had only 70,000 miles on it. After reading many bad reviews of people who had engines fail on them due to perhaps loss of oil I thought I had made a mistake buying this thing. However I have milked it for all it has and checked the oil whenever possible and adding it when needed...I recall reading one thread about the engines not having sufficient drain holes for the oil to settle back down into the pan and that is why you would get different dip stick readings every time...which I have It has been fun to drive and it holds all my gear. However my 4x8 utility trailer full of gear and the back of the trooper full of travel bags reallymadeitsag.
I bought a 1999 Trooper expecting the same performance as I had with my 1992. Boy was I wrong! I ran my '92 Trooper to about 150,000 with very few problems. The engine died at 68,000 on my '99 Trooper costing me over $4,000 to repair. How ironic that my warranty ended at 60,000 miles. Isuzu has known for a while about the inherent engine problems with the 1998 and 1999 Troopers. However, they refuse to do a recall.