Yes and no. I lost the original engine at 96,000 miles (1992) due to the infamous cavitation problem. Like many other people, I never added anything to the coolant since neither the manuals or the dealer ever said to do so (and in 1992 the dealer thought it was a bad casting!). Yes, I'm still pissed off about that one, and all these people who say "you should know better because ALL diesels require it" are full of ****. I've owned a lot of diesel equipment. Some diesels require it, others don't (go look at any OLDER diesel and tell me it needed it). I pulled the current engine from a wrecked truck with 17k on it. The 442k is on the current engine (I also changed the instrument cluster because the gauges were intermittant so the odometer is from the wrecked truck). My truck actually has 521k on it. Yes, I drove it to work today...

Bob