Diesel owners, step inside.

[bufmatmuslepants]

The LB7s 01-04.5 had injector issues, the LLYs from 04.5-05 had head gasket issues caused by the variable vane turbo, the 06-07.5 LBZs were said to have fixed all of that with lower compression, a better turbo, better injectors, and more power. The 07.5-10 LMMs had the DPF and all that emissions stuff that KILLED fuel mileage and had the same power and frame as the LBZs but in the new body style. The 11-12 LML has a much stronger frame, stronger suspension, gets better fuel mileage and has way more power than anything up until this point. It does have urea injection which is essentially pig piss to reduce NOX emissions, so that is kind of annoying to have to keep filled up. You can remove all of your emissions stuff on your LML but you will void the warranty, and its really hard to justify doing that on a $50-$70,000 truck. In my opinion the 06.5 is the best, because the 07s got the DPF. I have a friend with an 06.5 and a friend with a 07, both OBS, and the 06.5 gets 22mpg, the 07 gets 17 because of the emissions crap.