Quote Originally Posted by rapidoxidationman View Post
When were the head gaskets replaced? Did they use bolts or studs to clamp things back together?
Has the transmission fluid been regularly drained and refilled with a fresh screw on filter can?
Did the engine coolant get changed at 150K?
Is the truck bed whole or has there been a 5th wheel mount bolted on? (speaks to the engine's working life)
Has the seller been religiously using a fuel additive on every tank of fuel? ULSD diesel is not very slippery...

I have well over 230K miles on mine and replaced the gaskets at about 160K. Used ARP studs. Pulls like a freight train.
Can you give me some info on the fuel additive? I had a 2001 Duramax that we full timed with and never put anything in the tank except diesel. Did I do a bad thing? I'm just asking because I want to do right with my next truck. Also, what year trucks had to have an additional tank for the needed additive? Was it 08-09???