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  • How cold will a Duramax start?

    I am considering a duramax but my biggest concern is it gets cold up here in the winter! How cold can it be outside before I am going to have problems getting it started without pugging in the block heater?

  • #2
    Re: How cold will a Duramax start?

    Diesels really aren't as bad to start as people make them seem, especially glow plug Diesels like the Duramax. It's probably going to get down to at most 0-10 F before you start running into real issues. I know in 50-70 F they fire right up with literally an instant glow cycle. I'd worry about the fuel gelling before I'd worry about it not starting due to cold weather. It is, however, better if the block heater is plugged in. It may also be smokey and rough in cold weather until it warms up a bit.
    1994 K1500 ECSB 6.5/4L80-E
    1987 V20 Suburban DRW 6.2/TH400. WIP.

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    • #3
      Re: How cold will a Duramax start?

      Glow plugs eliminate the huge problem of cold starts.

      CHEVY 4 LIFE

      1995 3500 grounded, 6.5T all the toys
      1964 IMPALA (low&slow)
      1984 Kawasaki 750GPZ TURBO (low&stupid fast):aniteef:

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      • #4
        Re: How cold will a Duramax start?

        Originally posted by RCpullerdude
        Diesels really aren't as bad to start as people make them seem, especially glow plug Diesels like the Duramax. It's probably going to get down to at most 0-10 F before you start running into real issues. I know in 50-70 F they fire right up with literally an instant glow cycle. I'd worry about the fuel gelling before I'd worry about it not starting due to cold weather. It is, however, better if the block heater is plugged in. It may also be smokey and rough in cold weather until it warms up a bit.
        Im not worried about if its 0 to 10. That is a pretty nice day in January here! Its when its -15 and it is sitting out where it cant be plugged in Im worried about.
        Last edited by TheDozer; 04-02-2009, 09:27 PM.

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        • #5
          Re: How cold will a Duramax start?

          You will want it plugged in at -15
          06 truck

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          • #6
            Re: How cold will a Duramax start?

            Dmax are one of the best cold starting diesel engines. While its a good idea to plug them in below 0F they will start without issue in the -20sC. Fuel gelling is your main concern and seems to be somewhat more common issue with the Dmax. GM has came out with a new fuel filter that should fix that issue. The main source of the problem in the new ULSD fuel and being blended with Bio fuel which raises the freezing point a lot.

            These views expressed on this post are not my own, but rather randomly generated computer gibberish and in no way should be used to judge the author's IQ or mental health.

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            • #7
              Re: How cold will a Duramax start?

              MN does not get cold compared to up here.....

              No issues with my 6.5 or my TDI...friends with DMAXes don't have issues either. Of course, common sense has to be applied and you need to plug them in...
              07.5 LMM DMAX 2500 HD, ext cab, 4x4

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              • #8
                Re: How cold will a Duramax start?

                Anything under 0 your gonna want to plug it in.
                "Sex is like a casino, liquor in the front, poker in the back"
                98|GMC|Z71|5.7|CAI|TrueDuals|31/10.5/15|Eagle Alloys|4 HI headlight mod w/ 8000k HID's|RockfordFosgateT300-2|PioneerHU|Kenwood:fsg:
                2006.5 LBZ Duramax|4'' MBRP|Diablo Predator|Resonater Block off|L.E.D. pod gagues |

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                • #9
                  Re: How cold will a Duramax start?

                  What Im worried about is when it has to sit somewhere and it has to sit out and cant be plugged in. If its -15 is it going to start? Like I said sometime plugging it in is not an option.

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                  • #10
                    Re: How cold will a Duramax start?

                    Originally posted by TheDozer
                    What Im worried about is when it has to sit somewhere and it has to sit out and cant be plugged in. If its -15 is it going to start? Like I said sometime plugging it in is not an option.
                    You have a PM
                    1994 K1500 ECSB 6.5/4L80-E
                    1987 V20 Suburban DRW 6.2/TH400. WIP.

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                    • #11
                      Re: How cold will a Duramax start?

                      Webasto is the answer in that case....
                      07.5 LMM DMAX 2500 HD, ext cab, 4x4

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                      • #12
                        Re: How cold will a Duramax start?

                        Whats Webasto?

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                        • #13
                          Re: How cold will a Duramax start?

                          Didn't I answer this question? A Webasto is a heater that cost about $3K that burns a small amount of diesel to heat and circulate the coolant. Very handy to have and beats idling a lot, but not a necessity.

                          These views expressed on this post are not my own, but rather randomly generated computer gibberish and in no way should be used to judge the author's IQ or mental health.

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                          • #14
                            Re: How cold will a Duramax start?

                            get a gasser no problems here under zero degrees.. and you dont have to plug em in.

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                            • #15
                              Re: How cold will a Duramax start?

                              A friend of mine bought a duramax, he loved it. But with his job, he had to park the truck for weeks at a time in the winter at the shop where he and other employee's meet, and go out of state to do work.

                              He sold the truck, because after weeks of sitting at cold temps it would not start.

                              Now, my duramax I maybe plugged in only a few times this winter.
                              Even on the coldest days, it never failed to start, although it did gel up on me, once.

                              Even when it gelled, it still ran good, but stumbled on its face during accell.

                              If your going to have it running daily, you shouldnt have a starting issue, but Id say if it sits for days, or weeks... you'll probably definatley have an issue over time.



                              I could be wrong, but I thought I heard with that webasto heater, that it uses about a gallon of fuel every 4 hrs ?

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