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Old 01-25-2016, 09:10 AM
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First Diesel Winter Questions

Happy Monday Jeepsters,
Just a few questions that maybe some diesel owners could assist with. It's my first personally owned diesel, but been around them for a while with my family and the Army. Some things may be specific to the 3.0 liter. Thanks.

1. Mileage. Basically in the cold weather mileage dropped 5-6MPG on avg. Live in Southeast Pa, it's been in the teens/twenties over the past few weeks. I assume like gasoline, winter blend is garbage. So would any additives be warranted? Is this common to lose this much mileage? (current odo 5600)

2. Idling. I saw another thread about idling, but didnt really address if too much idling was an issue on these. I know diesel's idle forever and will not have an issue, however with DPF, is there a problem with random starts and long idling before leaving home/work/etc...

3. Jet/Sprayer warmer. Anyone install the washer nozzle heat exchanger on a diesel. I saw Jeep has one for sale that's rather generic, as do some others , but no mention of install on a diesel

*BTW, Jeep really needs to put front tow hooks back on everything. Whether it's hidden for the sporty stuff or behind a compartment, it has to be done. This weekend was proof in the pudding for the Northeast. My Summit with Forteras, no front tow hooks, and the snow plow lower bumper pretty much made it a plowed road highway Queen. (which I realize is my fault going into it) just saying.

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Old 01-25-2016, 09:36 AM
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Re: First Diesel Winter Questions

1. my '14's mpg gets a ding in cold weather, but not that much. Perhaps a bad tank, or it isn't fully broken in yet? (I've got 18k on mine now). I run additive in my '01 Cummins (235k miles) but haven't needed it (or the block heater) on the Eco yet. Live in Maryland, currently under 2'+ of snow.

2. According to the owners manual, long idling is NOT recommended due to exhaust component temps. I remote-start mine when I'm putting on my boots, and by the time I'm in the seat it's warm and so is the steering wheel. No real need to idle the Eco.

3. No experience, sorry.

However...for your last comment, use your air suspension. Lift the truck. In OR2 with stock 20" Forteras, I routinely navigate up to 12" of powder. Suspension up to Off Road 2, traction control off, and I actually have better luck with the 4x4 in "Auto". Just be careful with wheelspin/wheelspeed, because OR2 has a speed limit and it may lower on you unexpectedly.

Haven't needed 4x4 Low yet.
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Old 01-25-2016, 10:29 AM
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Quote:
Originally Posted by techvudu View Post
Happy Monday Jeepsters,
Just a few questions that maybe some diesel owners could assist with. It's my first personally owned diesel, but been around them for a while with my family and the Army. Some things may be specific to the 3.0 liter. Thanks.

1. Mileage. Basically in the cold weather mileage dropped 5-6MPG on avg. Live in Southeast Pa, it's been in the teens/twenties over the past few weeks. I assume like gasoline, winter blend is garbage. So would any additives be warranted? Is this common to lose this much mileage?

2. Idling. I saw another thread about idling, but didnt really address if too much idling was an issue on these. I know diesel's idle forever and will not have an issue, however with DPF, is there a problem with random starts and long idling before leaving home/work/etc...

3. Jet/Sprayer warmer. Anyone install the washer nozzle heat exchanger on a diesel. I saw Jeep has one for sale that's rather generic, as do some others , but no mention of install on a diesel

*BTW, Jeep really needs to put front tow hooks back on everything. Whether it's hidden for the sporty stuff or behind a compartment, it has to be done. This weekend was proof in the pudding for the Northeast. My Summit with Forteras, no front tow hooks, and the snow plow lower bumper pretty much made it a plowed road highway Queen. (which I realize is my fault going into it) just saying.
To answer your first question, if you're seeing that much of a hit you're probably having a passive regeneration occur on your DPF. There are no lights, EVIC notifications or anything like that. But it will cause your fuel economy to drop while its happening, as it injects fuel up stream of the DPF to combust in order to get the temps up.
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Old 01-25-2016, 10:56 AM
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Re: First Diesel Winter Questions

MPG does drop in cold weather. About 10% from what I've seen. On one very cold night (-7 degrees F) I could hear the fuel pump straining to move the slush. Since then have added Howes diesel additive and found no further problems.


Also there is a difference from one station to the next that I have experienced. Tend to look for the station the local tradesmen use as a good barometer. Lots of empty Howes bottles there as well.
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Old 01-25-2016, 11:07 AM
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Re: First Diesel Winter Questions

Quote:
Originally Posted by NorthstarSRX View Post
MPG does drop in cold weather. About 10% from what I've seen. On one very cold night (-7 degrees F) I could hear the fuel pump straining to move the slush. Since then have added Howes diesel additive and found no further problems.
Thanks for the heads up. I'm going to pick some up at lunch. There are many out there like any other treatment/additive, but was hoping to get some feedback from someone who actually used it.
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Old 01-26-2016, 02:08 PM
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Re: First Diesel Winter Questions

I see a drop of around what you see and it must be winter blend. I am in the Panhandle of Florida and temps hardly hit 20. Thus most of it has to be fuel. I have seen this now 3 times Feb 14, Jan-Feb 15 and now Jan 16 so I have data points that all seem to suggest fuel not increased friction...
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Old 01-27-2016, 04:15 PM
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Re: First Diesel Winter Questions

I can say that the biggest hits on mileage for me were the constant computer "Updates" and the new P20 EE CAT/SCR replacement. My mileage in the 1st 10K miles was easily over 30 MPG on hwy trips... But practically every service trip in got some kind of update and at 25 K the P20EE fix was done..

My daily around town avg is now appx 22 MPG and I can't seem to crack above 28 on 100+ mile interstate trips. 28k miles now.... Still happy with the vehicle but disappointed at losing mileage....
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Old 01-27-2016, 07:02 PM
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Re: First Diesel Winter Questions

I saw a similar drop in mileage as well. More than I would have expected. This is my first winter.
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Old 01-28-2016, 09:52 AM
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Quote:
Originally Posted by definn12 View Post
...you're probably having a passive regeneration occur on your DPF. There are no lights, EVIC notifications or anything like that. But it will cause your fuel economy to drop while its happening, as it injects fuel up stream of the DPF to combust in order to get the temps up.
You just described an active regeneration. In contrast, a passive regeneration happens *without* fuel being used to conduct the burnoff. Instead, the exhaust gas must be hot enough on its own to burn the soot (600+ C). As you can imagine, this is fairly rare, and most reports of it happening are while towing in a higher gear than might be recommended.

Active vs passive regeneration is orthogonal to whether a message regarding regen appears in EVIC. Those EVIC warning messages happen if the DPF fills past the threshold and the vehicle hasn't been able to trigger a regen. Normal regens are, as you said, silent; as a rule of thumb they happen once or twice per tank. If one wishes to know for certain when regens occur then one can monitor the relevant OBD-II pid or select this feature as an add-on when purchasing the GDE tune (both these options are available for NA EcoDiesels only; sorry, export CRD owners) .
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Old 01-29-2016, 04:41 PM
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Re: First Diesel Winter Questions

Winter blend drops mileage for me. It's even worse when it's really cold (like -20F) and I fill up with #1 diesel.
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Old 12-19-2016, 10:03 AM
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Re: First Diesel Winter Questions

Was out driving last weekend with air temperature at -23F and was able to maintain normal oil temps driving at 65 MPH. After sitting out for two hours before the trip back home, I did notice that it took about 30 seconds to drop from 7th to 8th gear after I finished accelerating to freeway speed.
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Old 12-19-2016, 12:39 PM
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Re: First Diesel Winter Questions

Several things affect winter mileage:
1) winter blends of diesel
2) where you get your diesel from
3) driving habits- like remote starting and letting it idle for 10+ minutes
4) what gear oil is in your front and rear diffs, and transfer case. Remember that even though the engine will warm up eventually, the heavy gear oil in every other system in the driveline is thick, heavy molasses.

With my newly wired block heater, with this morning's air temp at -12, my oil temp was a balmy 68 degrees. That's a huge difference. On Saturday when it was 6 outside, it took 2 miles to get the oil temp up to 68 before I got the heater cable connected.

So in really cold weather, all fluids, including your diesel, is thick gooey stuff that creates a lot of resistance which means lower mileage. This morning on my -12 commute I got 18 mpg over the full drive, where in warmer temps I get 23-24.
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