 I purchased this vehicle from the original owner with 90k on the clock and currently have 150k on it.  In the 6 years and 60k miles I've owned it has given me ZERO problems. Starts up every time, runs quiet, shifts smooth...runs like a top! Not to mention the resale on them is insane. My 1999 is worth more in 2018 than a 2006 Xterra. Ive owned 4 4runners in my life (87, 93, 99 and 00) and in my experience the 3.4 is the BEST engine Toyota ever put in the 4runner. Its a little under powered (as is every 4runner made until 2003), but if you are looking at this vehicle, you are probably more concerned about reliability than 0-60. Ive seen them on craigslist with 300-500k miles on them, and as long as you keep up on routine maintenance. If you love them, they will love you back. Even if you don't love them....they will still love you back