Wow lots of info. I plan on keeping this tough rig for sometime, the frame is good, and we are doing some mild body work to her. recently I had some issues with the oil pressure gauge, NO NOISE, just the idiot gauge when cold would take forever to come to normal range. It would go to the far left. I am running Pennzoil Dino 5 W 30 for the winter, we had 4 weeks of very sustained cold. OCI's are 3000-4500 I do a variety of work from heavy hauling to towing not on a regular basis. In the winter time this is my DAILY driver as it moves right through anything.
Bought her back in 02 with 114,000 and a regular service record.
I have run the following oils only in the last 7 years.
Pennzoil Dino, Formula Shell, Wolfs Head, and 1 change with Supertech HM (red bottle) Mainly Wolfs head and Pennzoil. 10W30 in the summer fall and cold winters 5W30