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How cold will a Duramax start?

This is a discussion on How cold will a Duramax start? within the Duramax Forum forums, part of the General Discussion category; I am considering a duramax but my biggest concern is it gets cold up here in the winter! How cold ...

  1. #1
    Registered User TheDozer's Avatar
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    How cold will a Duramax start?


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    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?

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    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.
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    Registered User Mantovanelli's Avatar
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    Re: How cold will a Duramax start?

    Glow plugs eliminate the huge problem of cold starts.

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    Registered User TheDozer's Avatar
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    Re: How cold will a Duramax start?

    Quote 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 at 08:27 PM.

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    Registered User Farmer98's Avatar
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    Re: How cold will a Duramax start?

    You will want it plugged in at -15
    06 truck

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    Registered User dozerboy's Avatar
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    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.

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    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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    Re: How cold will a Duramax start?

    Anything under 0 your gonna want to plug it in.
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    Registered User TheDozer's Avatar
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    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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    Re: How cold will a Duramax start?

    Quote 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.
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    Registered User chrisk1500's Avatar
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    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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    Registered User TheDozer's Avatar
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    Re: How cold will a Duramax start?

    Whats Webasto?

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    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.

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  14. #14
    dave94K1500
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    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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    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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    Re: How cold will a Duramax start?

    Search youtube. Plenty of vids on cold starts on a dmax. They definently start better than a 12v or a powerjoke. Even the 6 leaker powerstroke doesn't start very good when cold. The dmax's will fire right up, so long as you put some additives in to keep em from gelling up. That will be a problem before not starting will.

    If it's plugged in, you won't even notice it's cold out. If it's not, it'll still start up no problem, but just kick the high idle on to warm it up faster.
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    Re: How cold will a Duramax start?

    sorry, old thread, but if anyone tells you duramax's wont start in the cold they are full of crap.

    Here is mine starting at -7* without being plugged in, lower than stock compression, and ON ONLY ONE BATTERY.

    http://www.youtube.com/watch?v=6iA72Mzv9ek

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    Re: How cold will a Duramax start?

    you can do pad heaters on the tranny pan and oil pan and the block heater as well and thats the standard for here in alaska and they will start if you don't have weak batteries also get the glow plugs nice and hot by turning them on 3 or so times, theres a company called zero start that actually has a coolant heater which runs a mechanical pump tapped into your coolant lines and we install those on most our heavy equipment which is also diesel and they get amazingly warm fast, hell even some of our diesel powerstrokes not plugged in at 40 below will pop off if you hit the glow plugs a few times, i wouldnt recommend doing it to your personal truck, its kinda rough on the motor

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    Re: How cold will a Duramax start?

    Quote Originally Posted by alaskadg87 View Post
    you can do pad heaters on the tranny pan and oil pan and the block heater as well and thats the standard for here in alaska and they will start if you don't have weak batteries also get the glow plugs nice and hot by turning them on 3 or so times, theres a company called zero start that actually has a coolant heater which runs a mechanical pump tapped into your coolant lines and we install those on most our heavy equipment which is also diesel and they get amazingly warm fast, hell even some of our diesel powerstrokes not plugged in at 40 below will pop off if you hit the glow plugs a few times, i wouldnt recommend doing it to your personal truck, its kinda rough on the motor
    cold starts are a 100 times harder on a diesel than any gas engine, Sure they may start but i dont know why anyone would want to put they're engine through that, plug the bugger in and if you cant plug it in all the time invest in a Wabasco or Espar coolant heater. You can program the Espar/Wabasco heater for 7 days to automatically come on when ever you want for how ever you want. they draw about 1amp/hr and burn about a liter of fuel in 4hrs.
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    Re: How cold will a Duramax start?

    if your on a budget buy the pad heaters and block heater and run them to a three way splitter, this is the standard up here and it works

 

 
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