I had a question of what mileage is expected out of a Duramax and what the factory warranty is as well as what voids it. The reason I ask is I know the Duramax as well as the Cummins and Powerstroke are strong motors (also know the PS has some fuel issues), but the Duramax is the only one with aluminum heads. There have not been any issues with them that I know of but under extreme boost (due to aftermarket mods), what is the life expectancy? We had a guy at the pulls the other night in a Duramax. The thing sounded insane as he backed down the track. I couldn't tell if it sounded like a diesel or gas motor (actually it didn't sound like either). He smoked a pumped Cummin's and PS equipped trucks. The only guy that beat him was a twin turboed Cummins (which is a completely insane truck). Most guys (especially gassers) run 1 gear without shifting and some diesels hit two gears, this guy was in third gear by the end and still pulling (the sled operator hit the brakes). The strongest (extremely built 454) gasser just about hit a full pull, the guy in the Duramax would have made it well past if it wasn't for the fact there was a wall off the end of the track. I assume he had a modded computer, exhaust, possibly turbo upgrade, and propane. It is frickin' insane power, but wondering what that does to a Diesel motor. I know you can pump insane horsepower out of a gasser but it generally comes at the expense of longevity, just wondering if it's the same for a diesel and if it is, is it alot or negligable.