Soooo this happened today. Not sure if this is a big deal or not, but here's the background.
206K miles, limited maintenance history. I've had the vehicle for about 8K miles, its had no drivetrain issues that indicated poor maintenance or abuse, but its not one of those impeccably maintained vehicles with service records every 5K for the life of the vehicle.
Drove about 10 miles down the beach Saturday, camped saturday night. Tire pressures low at 12 PSI, sand wasn't too soft. Kept 4WD and center diff locked the whole time. No problems.
Broke camp this morning, raised tire pressures to 20PSI because 12 was too low, and not stable. Drive another 15 miles down the beach. A/T oil temp light came on right at the end for about 30 seconds. I was cruising between 20 and 40 depending on the sand conditions. It came on right after a bout of cruising at 35-40ish.
Light went back off, code reader didn't find any codes. Nothing leaking or broken underneath, I didn't hit anything. We turned around and drove 25 miles back on the same beach with no issues, and drove another 150 miles back home. No further problems.
What do I do next? I'm not sure if this was a fluke from driving too fast with the center diff locked, or what. I feel like i need to at least do a full tranny flush/fill. Really not sure what to do past that. Is this an actual indicator of a potential problem, or could this have been a non-problematic fluke?
Obligatory pic of the rig on said beach trip...