We got off work a little early on Chrismas eve, so a few of us went wheeling close to town. My big truck was down with a engine overhaul so I took the FJ. Found a little spot that was muddy on the neck of a lake and went through it, and locked the engine up with 70k miles. I am a tech, and change the oil every 3k with synthetic motorcraft oil. Took the engine out this weekend and dropped the oil pan and found the last two cylinders had spun rod bearings with no other problems. Anybody had this problem, and how do I not repeat it, these motors are high!