Hi, just hit 300k on Jan. 9, 2017 on my 2004 Toyota 4Runner SR5 4WD I bought new in March of 2004. I've changed the oil and filter every 5000-5500 miles and try to keep other things in order. Had an issue with 4WD electronic actuator at around 200k, but otherwise trouble-free. Runs great and I plan to keep driving it. 400k? Hope so!