i had a 97 3500 drw with the 6.5L TD and it was agreat diesel not a power house and if you add power you will blow internals but when they are stock they do an excellent job allthough they are know for losing the fuel pump and then blowing the injecters,but gm extended the warranty to 120,000 miles for that issue..i would recommend the duramax,before the 6.5L..
We always ra the 6.2 and 6.5 as farm trucks and worked the hell out of them. We hada 6.2 with almost 400K on it with the stock engine, My Dad's '98 6.5 has 240K on it, and it is all original. Although I won't argue about the more power in the d-max. But the stock longevity was fair.
Probably not. Because you can build a RAT motor out of a 454. The only thing is, is that if you add mods to a diesel they usually help mileage, while if you add mods to a 454 your mileage DROPS. just my .02 cents.
my parents have both a suburban with the 454 and one with the 6.5 and the 454 is far better at towing but just does not seem to be as cool when you drive around but i agree the 6.5 put GM in teh diesel market and without would not have teh 6.6 and it is a great motor better than any gasser
Hey sorry guys for being one of those guys who just come in once after they sign up and leave. Im back and after buying a 73 nova im now looking for a diesel truck. What mileage do you all get with your 6.5s compared with the 6.6? I would get a 6.5 but definately wouldn't go overboard with mods. Just a tuner ,exhaust or something. Thanks again for your help
YES.........BUT the longevity of them even in stock form is questionable.
I had a modded 95' 6.5TD suburban that ran great between rebuilds due to Blown headgaskets(3), Pitched rod(1), failed turbo(1), and a failed injection pump(1).
Not too big of a 6.5L TD fan here, I don't mean to sound negative, that's just my experience with that motor....
Several other friends locally have had tremendous reliability problems with them as well, so I'm not alone.
Be careful and maybe keep a good luck charm on the dash! :drink
the 6.5L are prone to over heat form minor problems with the cooling system. Heath has a lot of add-ons for these old trucks. Just look at the reliability stand point and upgrade the factory flaws. For the price they are good bet for great millage.