How cold will my Duramax start without plugging in - Page 3 - Chevy and GMC Duramax Diesel Forum
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post #21 of 115 (permalink) Old 01-07-2013, 09:30 PM
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I would reccomend 5w40 synthetic if it is going to be in cold weather often. I've used both, and it's amazing what 15w40 vs 5w40 starts are like. Post some pics up when you get it!
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post #22 of 115 (permalink) Old 01-07-2013, 09:39 PM
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Lowest I have started mine is -46. Coldest day of the year and they decided to plow the streets (where my truck is usually parked)... Had to move it quickly so no time to let it warm up. Three glow plug cycles and it fired up. Shook like a bastard though. Trans locked out all shifts from 1st onward, TC acted a little funny, but it moved. I wouldn't recommend doing that ^^^ too often.
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post #23 of 115 (permalink) Old 01-07-2013, 10:44 PM
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Originally Posted by usafracer View Post
-52 here once. It was not happy and I will NEVER do it again if I can avoid it. With good batterys and cycle the glow plugs twice it will start.
WOW!!!!!! That's good to know at that temp!!!

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post #24 of 115 (permalink) Old 01-08-2013, 04:50 PM
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-28 here in North Dakota, not plugged in, sat for 16 hours. I let the glow plugs cycle 2x and she fired right up...sounded like someone threw a box of nuts and bolts in the engine for a minute but she smoothed right out. I start anywhere between -30 and 0 on a daily basis, usually plug it in on a timer set for 4 hours before I head to work, with it plugged in it starts no problem and the glow plugs will only cycle for a few seconds.

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post #25 of 115 (permalink) Old 01-08-2013, 04:52 PM
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Originally Posted by mike diesel View Post
I start my lly cold in 10 degrees temps daily without issues. A little shaky and smokey but she fires right up no problem.

Just turn the key on, wait for the wait to start/coil light to go off then fire it up.

And trust me, your new lmm WILL NOT leave you stranded like your old stroker did. Duramax is a whole new machine compared to a 7.3
Agreed 100%!

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post #26 of 115 (permalink) Old 01-08-2013, 05:17 PM
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Mine has no trouble starting up in the cold. I've seen -24 and it started fine without plugging in. Obviously not as easy as the summer but I wasn't worried for a second it wouldn't. I do try and plug it in if its available and it gets below 15 degrees or so.




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post #27 of 115 (permalink) Old 01-08-2013, 05:25 PM
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-21f was coldest ive seen and it started without plugging it in.

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post #28 of 115 (permalink) Old 01-08-2013, 05:37 PM
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Have had temps around zero for a couple weeks and never once plugged it in. I just let the plugs cycle once on my LML and started right up.

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post #29 of 115 (permalink) Old 01-08-2013, 05:48 PM
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Originally Posted by Duramax381 View Post
I'm from Texas, usually I will plug mine in when below 20 degrees F. For us down here, that is damn cold. I have had this truck for 2.5 yrs now, and only had to plug in once when got down to 16 degrees F one night. Only thing is, remote start does not work when plugged-in to block heater.
Thats weird my 08 will auto start with the block heater plugged in.

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post #30 of 115 (permalink) Old 01-08-2013, 09:17 PM Thread Starter
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Originally Posted by TBone View Post
Thats weird my 08 will auto start with the block heater plugged in.
On this forum , several people have said the remote starter doesn't work when their truck is plugged in. Others ; like yourself , say it does.

Does anyone know what the truck is suppose to do - in regard to remote starting while the block heater is plugged in ? I mean , do different years behave differently , or are some trucks just not functioning properly ? ( just curious )
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