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Leaving a diesel idle in between stops in the cold #4623175
01/03/18 09:25 PM
01/03/18 09:25 PM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
Houston, Texas
The temps have been around 30 the whole week in Houston and it takes about 15 minutes for my truck to warm up and that's driving it. So then if you [censored] it off for 25 minutes or so it practically cools back down. Then there goes the heater. How many of you just let it idle in between trips when you run in somewhere and it's only going to be 20 minutes or so.

Last edited by motor_oil_madman; 01/03/18 09:26 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623189
01/03/18 09:37 PM
01/03/18 09:37 PM
Joined: Jun 2002
Posts: 19,525
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,525
Iowegia - USA
If you lived up here where it has dropped down to -21F, there is no alternative.


Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623195
01/03/18 09:44 PM
01/03/18 09:44 PM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
Houston, Texas
I'm just starting to see why they do it.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623196
01/03/18 09:44 PM
01/03/18 09:44 PM
Joined: Oct 2015
Posts: 446
MN
TmanP Offline
TmanP  Offline
Joined: Oct 2015
Posts: 446
MN
In the past week, we have gotten fifty degrees colder than you, and I still don't do that! I mean it's your truck, and your diesel. Three or five minutes? Sure. But twenty? I'd shut it off.
But here, even in the extreme cold, I don't idle for more than a couple of minutes.
Why? Fuel dilution, the fact that idling isn't great for the engine, and the fact that the fuel isn't free.
That said- stopping in for coffee and a donut? I let it run, if it's truly cold (below zero or so).
But grocery shopping or something like that? I shut it off.

Of course, do what you're comfortable with! Just a northerner's perspective.


2012 Toyota Camry 2.5 30,000 mi
2015 Chevy Silverado LT Z71 5.3 V8 30,000 mi
2010 Toyota Sienna 3.5 V6 150,000 mi
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623204
01/03/18 09:47 PM
01/03/18 09:47 PM
Joined: Dec 2016
Posts: 7,171
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,171
Waco, TX
New thermostat?

You just described exactly what my Cummins was doing, until I changed the thermostat.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Leaving a diesel idle in between stops in the cold [Re: TmanP] #4623208
01/03/18 09:50 PM
01/03/18 09:50 PM
Joined: Dec 2016
Posts: 7,171
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,171
Waco, TX
Originally Posted By: TmanP

Why? Fuel dilution, the fact that idling isn't great for the engine, and the fact that the fuel isn't free.


Maybe not all diesels get fuel diluted.

In North Dakota in the winter, I'd let the International TD-9 idle for days - or it would be EXTREMELY hard to start again.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623211
01/03/18 09:53 PM
01/03/18 09:53 PM
Joined: Mar 2012
Posts: 1,370
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,370
San Antonio, TX
Its illegal in some parts. I have had a cop tell my to turn my 300sd off at a gas station.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623215
01/03/18 09:56 PM
01/03/18 09:56 PM
Joined: Oct 2012
Posts: 2,332
Northern Ontario, Canada
Danno Offline
Danno  Offline
Joined: Oct 2012
Posts: 2,332
Northern Ontario, Canada
I suggest turning it off. Diesels warm up when under a load. Idling is a waste of diesel and shortens the life of diesels. I've run well over a thousand in a fleet, mostly Ford 7.3, and 6.0.


2016 Sorento SX V6 AWD
2015 KIA RIO SX
2010 Mazda 3 2.0L
2009 Venza V6 AWD
2013 Sonata 2.4L RIP in write-off crash
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623228
01/03/18 10:06 PM
01/03/18 10:06 PM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
Houston, Texas
I would think the constant warming up and cooling off would be worse.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623233
01/03/18 10:13 PM
01/03/18 10:13 PM
Joined: Sep 2004
Posts: 7,826
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,826
Marshfield , MA
Block off 3/4 of the radiator with some card board. It isn't gonna stay this cold forever. That way the truck will get warm faster, and cool off slower when parked.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623244
01/03/18 10:31 PM
01/03/18 10:31 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
My '82 Benz starts warming up fairly quickly. If more of my daily driving regimen was trips long enough to get it truly warm I'd be more keen on shutting it off when it'll sit for more than a minute or so, but unless it's already fully warm I'll leave it run for up to 10 mins. in some cases. The OM617 is a tough powerplant - I figure a few more minutes on the oil and keeping the oil up in it is better than keeping it below operating temp. + putting it through that many starts and temperature cycles. It seems to burn very little fuel at idle, too, so that takes a little of that nagging idea that I'm burning away $$$ for no good reason.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623257
01/03/18 11:02 PM
01/03/18 11:02 PM
Joined: Mar 2010
Posts: 505
Chicago Suburbs
Nitronoise Offline
Nitronoise  Offline
Joined: Mar 2010
Posts: 505
Chicago Suburbs
some states have "NO IDLE laws and zones for big trucks , I dont know if they apply to light or medium duty diesel trucks

if your going to idle for an extended period of time , bump the the throttle up to about 700 -800 rpms that way you will be having consistant oil pressure to lube up the turbo and you will find it easier to keep your emmissions profiles in line ,, my old 2012 KW T680 with a PACAR motor always had emmissions issues when idling at 600 rpm in the cold or summer , at 800 RPM , NO PROBLEM, and at 700-800 RPM you circulate more warm return fuel from the pump to keep your fuel warm and it prevents cross overs between tanks from freezing or gelling in-20 weather

Last edited by Nitronoise; 01/03/18 11:06 PM. Reason: additional info

07 Ford Freestyle 135K
04 Hyundai Sonata 280K
03 Hyundai Santa Fe 165K
02 Ford Tarus 98K
00 Buick Regal SC 135K
95 Goldwing 28K

Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623267
01/03/18 11:27 PM
01/03/18 11:27 PM
Joined: Feb 2015
Posts: 773
Sask, Canada
BrianF Offline
BrianF  Offline
Joined: Feb 2015
Posts: 773
Sask, Canada
In the extreme cold, if its only a few minutes I will idle it. If it is more than that I just shut it off. My new diesel starts like a dream in the cold. The seasonal blended fuel has not give me a lick of trouble either so I am not worried about it gelling.

Only once, not long after we bought it did we leave it idle for an extended period. I think the ambient was -35C or so and a heavy wind chill. Winter front closed up, idle up to 100orpm and the exhaust brake on. Thing was toasty!


2006 Trailblazer LT. QSUD with Fram Ultra.
2017 Ram 3500 SLT Megacab. Duron SHP 10w30 with Hastings LF608.
1993 GMC 1500. QSAD with Fram PH5
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623331
01/04/18 04:03 AM
01/04/18 04:03 AM
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
A deisel isn't like a gas engine, I d let it run.
Deisels are made to start up and keep running. Not for start and go stuff. Let it run, the fuel use is so small. Up North everybody in the winter time let their deisel trucks idle while they were in church.
It's better for them.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: Leaving a diesel idle in between stops in the cold [Re: motor_oil_madman] #4623339
01/04/18 04:40 AM
01/04/18 04:40 AM
Joined: Sep 2013
Posts: 10,683
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,683
Indiana
Delivery drivers such as UPS and FedEx turn their truck off at stops.


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

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