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VW Touareg TDIs This is a general discussion about Touareg TDIs. Non TDI related postings will be moved or removed.

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Old July 29th, 2019, 21:38   #1
buguyed
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Default Excessive AdBlue Usage?

I purchased a 2016 TDI Touareg at the end of May. After the first trip pulling our 4,000 lb camper it needed AdBlue. Thought nothing of it and went to the dealer for a free fill up. This weekend we came home from camping again and the AdBlue now has 60 miles to empty! Itís literally gone about 900 miles on a tank of AdBlue. 350 of those miles were pulling the camper... pulling the camper we are seeing only 11-12 mpg while everyone always raves about 14-17 mpg pulling similar campers. Doesnít matter how nice I drive no changes.

Even when we arenít pulling the camper the mpg hasnít been that great around town. Wife has been seeing 15-19 mpg everywhere and we got 26 driving empty on a short trip. Should I call the dealer and ask them whatís going on? Has anyone experienced questionable mpg and extremely fast AdBlue usage?
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Old July 30th, 2019, 07:09   #2
showdown 42
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Well 2 things that are probably going on, It appears you are in Mountain territory so that adds to the pressure on the engine and adds to use of adblue and the altitude also contributes to more usage.

I have a 2016 TDI TREG and drive in the low land and get 10,000 miles on a tank of ad blue. Driving to FL going 75-80 MPH I get 30MPGs. I've made 3 round trips of 3000 miles with those results. I is worth having the rig checked out to make sure nothing is adjusted wrong. When I tow a boat which is only 2500#s I will see 15-17 MPGS.
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Old July 30th, 2019, 08:04   #3
alext91
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wow, that's interesting. Unrelated and not helpful, but my wife and I are still waiting on the warning for her 2015 Golf, which we've done 13,000 miles in since we bought it, and no sign of needing AdBlue yet...
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Old July 30th, 2019, 09:39   #4
ZippyNH
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Likely you ARE using more due to towing... surely you are using more due to lower mpg...
That having been said...
Look around for a possible leak ..
A white crust is typical for a DEF leak...

But also DEF is so cheap...only $2.99-3.99 a gallon at a truck stop (same stuff and fresh) I wouldn't consider it worth going to a dealer if it was more than 5 minutes out of my way....
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Old July 30th, 2019, 09:44   #5
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Another thought... towing is usually a drop, but not a HUGE drop in MPG.... mountains can be a big part, but driving style is huge too....
When towing.... don't try to drive like you are even keeping up with traffic... honestly...you want a steady stream of cars passing you and a steady pressure on the pedal, minimizing shifts.....
If you are feeling constant shifts, major RPM changes....you might be trying to simply go faster than you should in the hills for the motor you have.
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Old July 30th, 2019, 09:45   #6
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That use seems way high. My best guess is that the dealer didn't actually fill the tank and just got enough Adblue in there to clear the "miles to empty" warning.

Are people getting all of their Adblue filled for free while under warranty? I had a service writer tell me that he confirmed that the free fill was only between scheduled services. So they'd fill it free at 155k, but then I'd pay at 160k, then VW would cover it at 165k. I don't think he was right, but I'm not wasting my time going to the dealer for $12 worth of Adblue either so I don't care.

I don't have good records on how much our Treg uses post-fix but I think it takes a 2.5 gallon fill every 3000-5000 miles.
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Old July 30th, 2019, 12:28   #7
buguyed
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The funny thing is I get better mpg pulling the camper through the hills. I donít baby too much it in the hills either. Iíll have them check for a leak when I bring it to the dealer for fun.

Dealer said my AdBlue refills are free until my power train warranty is over. 10 years 120k miles.

Still think the car should be doing better mpg when empty, especially on the highway. Hate this stupid emission crap but the warranty is nice
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Old July 31st, 2019, 06:52   #8
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I have not really noticed a huge change in DEF consumption while towing our 6500lb trailer but in general I only tow about 300 to 400 km per trip and I don't do more than 3 or 4 trips between 15K Km services.



People towing similar trailers to mine with the same vintage Touareg have mentioned that they are only getting 100kM per Liter of DEF when towing. Yes, that's right, they say they are adding about 10L of DEF for every 1000km towed. I have heard this from 2 other Treg owners. This is since the emission fix btw.



This is what I have heard but I cannot confirm it with my experience yet.
Kevin
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Old August 29th, 2019, 10:13   #9
maxTouareg
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Default DEF during towing

Quote:
Originally Posted by ksa63 View Post
I have not really noticed a huge change in DEF consumption while towing our 6500lb trailer but in general I only tow about 300 to 400 km per trip and I don't do more than 3 or 4 trips between 15K Km services.


People towing similar trailers to mine with the same vintage Touareg have mentioned that they are only getting 100kM per Liter of DEF when towing. Yes, that's right, they say they are adding about 10L of DEF for every 1000km towed. I have heard this from 2 other Treg owners. This is since the emission fix btw.


This is what I have heard but I cannot confirm it with my experience yet.
Kevin

I can confirm the approximately 1L per 100km during towing. Drove across Canada with a trailer and needed to keep a stock of DEF onboard. I was hoping that the 1L/100km was too high.....

During non-towing driving however, the Teg consumes about 1L per 1600km.
Regards,
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Old August 30th, 2019, 19:32   #10
Fourdiesel
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It is to be expected that DEF usage would increase with load - ie towing. The purpose of the DEF is to reduce NOx. NOx is only produced in excessive quantities under the higher load conditions when combustion temperatures are at their highest. High temps mean more NOx therefore more DEF is required to neutralize the NOx to acceptable limits. Tow a heavy load up a long steep hill = max DEF usage. Downhill - none!
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