Mark, thank you so much for the awesome information...I am new to buying a diesel engine but have been looking for the past 6 months and am amazed at all the info I am finding out about these things.

Another question I would like to ask you is comparing the 6.6L Duramax engine with a couple other shuttles I'm looking at. Currently on my list is a '99 Chevy El Dorado 3500 shuttle with two dualies in the rear. I'm not sure the exact engine but it has an original 75,000. The other shuttle is a 2001 turtle top with a a Ford E450 7.3 L engine w/ 95,000

So my question is what is the best bet of these three engines overall comparing mileage on the engine, towing a trailer, and the year of the engine, (remember the 6.6L Duramax has 160,000 miles)..obviously things like, price, fuel injector replacement, and wear and tear is a separate issue..

Sorry, I dont have the vin number for this vehicle yet but I will try and get it for you...

Thanks again for all your help!