How many miles can you expect out of a Duramax?

Discussion in 'Trucks and Trailers' started by BadRancher, Feb 27, 2010.

  1. BadRancher

    BadRancher LawnSite Fanatic
    Messages: 5,892

    I ran across a nice 05 GMC with a Duramax in it. The truck has 199,000 miles on it. It is a good deal for $12,000. But I need to know how many more miles I can expect out of it.
  2. TXNSLighting

    TXNSLighting LawnSite Fanatic
    from DFW, TX
    Messages: 6,464

    Depending on how its been maintained, it seems they will hit the 300-350k mark. Maybe even more.
  3. ProScape Canada

    ProScape Canada LawnSite Member
    Messages: 18

    I was looking in to the 6600 Duramax engine and they seem to go 300-350 but I've seen some hitting 400-500 and one rolling at over 700. The 700 was on a GMC 5500.
  4. lawn king

    lawn king LawnSite Silver Member
    Messages: 2,380

    There is one over @ dieselplace with 700,000 + miles on it. Original motor & tranny, still running well. There are many members over there with high mileage on oem motors & injectors!
  5. fool32696

    fool32696 LawnSite Senior Member
    Messages: 993

    I wouldn't pay that much for it regardless of options. Mine ran PERFECT when I sold it with over 130k on it. It used a little oil, maybe a quart every oil change which was about 8000-9000 miles.
  6. rcslawncare

    rcslawncare LawnSite Bronze Member
    Messages: 1,684

    Id stay in the 140-160k range, there going from 12-16k. If its clean and has records, then go for it! 5th wheel or gooseneck on it?
  7. BadRancher

    BadRancher LawnSite Fanatic
    Messages: 5,892

    I got a chance to drive it today. The engine and tranny drive like a champ. I had a concern on what the dealer says are the tires. Also the oil pressure sits low when idling warm. I dunno if this is normal on diesels or not. Also I swear the temp guage has got to almost the 210 mark before it settles at the quarter ways mark. I got the guy down to 11000 on price, but I'm still not sure on it yet. As listed on KBB and NADA it is about $6000 less the what the dealer has listed. It looks to of never had a goose neck/fifth wheel in it, so thats a good sign of no real heavy pulling.
    Last edited: Feb 28, 2010
  8. tnmtn

    tnmtn LawnSite Bronze Member
    from NE Tn.
    Messages: 1,022

    both duramax's i have had the oil pressure drops when at idle after it's warmed up. comes up fine when accelerating or when running.
  9. rcslawncare

    rcslawncare LawnSite Bronze Member
    Messages: 1,684

    Yea, thats what I look for in used trucks with a lot of miles. I see a lot of RV transports around here, what's with the tires? Hum or shake?
  10. 360ci

    360ci LawnSite Senior Member
    Messages: 995

    TBO is rated at 250K for Duramax V engines, but that's nothing these days for a diesel. Keep in mind you can get a Duramax 7.8L I6 in heavier C and T GM trucks that will more or less outlast the frame.

    I had a 6.5L V8 GM diesel in a 3500 extended savanan (with insulated box and reefer on roof) that just turned 1million kms, or 600K miles before I traded it in. The drivers door fell off three hours away, and I never would have expected that which is why I decided to sell it. I'll also add that it would smoke heavily when you pushed the throttle down over 50%, even in low rpms. At around 75% throttle it would downshift and black smoke would be everywhere.

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