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Old 01-09-2014, 01:05 PM   #1
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Default Q5 Carbon on exhaust tips

Does anybody have advice for removing the carbon build-up on the chrome exhaust tips on a 2014 2.0T? I hand wash the car several time a week and when it was new the carbon came off very easy. Now at 4,100 miles it no longer wipes off with a towl or sponge and is getting harder to remove. Any tips?
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Old 01-09-2014, 01:53 PM   #2
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I sprayed on WD40 and wiped off with a rag. No more carbon build up. Any carbon residue will wash off easily.
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Old 01-09-2014, 01:54 PM   #3
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Does anybody have advice for removing the carbon build-up on the chrome exhaust tips on a 2014 2.0T? I hand wash the car several time a week and when it was new the carbon came off very easy. Now at 4,100 miles it no longer wipes off with a towl or sponge and is getting harder to remove. Any tips?
Perhaps a good metal polish? I use Zainx and I could be spelling that wrong as I'm going from memory (it's cold in the garage!).
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Old 01-09-2014, 02:42 PM   #4
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I've used NeverDull - in a blue can - in the past with very good results. It's a chemically treated cotton that doesn't scratch.
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Old 01-10-2014, 01:11 PM   #5
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Get a TDI I haven't seen any carbon yet...At least not near as much as on my 2.0t
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Old 01-10-2014, 01:56 PM   #6
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After 14 months I don't have any build up on the tips. I wonder what would make the difference? Gas type? We're 10% ethanol around here.
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Old 01-10-2014, 02:08 PM   #7
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After 14 months I don't have any build up on the tips. I wonder what would make the difference? Gas type? We're 10% ethanol around here.
I'm pretty sure we are 10% ethanol as well. What octane gasoline are you using. My dealer told me when I bought the car to run 89 octane. I questioned him since the owners manual says to run premium fuel. He explained that premium fuel in Germany is 89 octane.
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Old 01-10-2014, 02:19 PM   #8
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I'm pretty sure we are 10% ethanol as well. What octane gasoline are you using. My dealer told me when I bought the car to run 89 octane. I questioned him since the owners manual says to run premium fuel. He explained that premium fuel in Germany is 89 octane.
I alternate between mid-grade (89 octane) and premium (91).
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Old 01-10-2014, 02:52 PM   #9
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Originally Posted by plumber212 View Post
Does anybody have advice for removing the carbon build-up on the chrome exhaust tips on a 2014 2.0T? I hand wash the car several time a week and when it was new the carbon came off very easy. Now at 4,100 miles it no longer wipes off with a towl or sponge and is getting harder to remove. Any tips?
AS Q5TDI has posted, Try Neverdull. You can find it at most auto parts stores. It's cotton matting won't scratch, and leaves the surface a little oily so the buildup won't come back as fast.
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Old 01-10-2014, 03:07 PM   #10
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I'm pretty sure we are 10% ethanol as well. What octane gasoline are you using. My dealer told me when I bought the car to run 89 octane. I questioned him since the owners manual says to run premium fuel. He explained that premium fuel in Germany is 89 octane.
I think your dealer is dyslexic. Premium fuel in Germany is actually 98 RON, which equals 93 AKI (the octane scale we use in NA). Regardless, octane has nothing to do with tailpipe soot. Soot is most likely a function of the DI fuel delivery and DI engines typically run very rich on cold starts. If your driving pattern is typically lots of shorter trips with fewer long ones there'll be more soot. Also, any oil consumption will contribute to fouled tips.

I've owned four vehicles with DI, and the only one that didn't have a lot of tailpipe soot was an F150 which was 90% highway driven.
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Old 01-10-2014, 03:13 PM   #11
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I think your dealer is dyslexic. Premium fuel in Germany is actually 98 RON, which equals 93 AKI (the octane scale we use in NA). Regardless, octane has nothing to do with tailpipe soot. Soot is most likely a function of the DI fuel delivery and DI engines typically run very rich on cold starts. If your driving pattern is typically lots of shorter trips with fewer long ones there'll be more soot. Also, any oil consumption will contribute to fouled tips.

I've owned four vehicles with DI, and the only one that didn't have a lot of tailpipe soot was an F150 which was 90% highway driven.
This car is typically driven 12 miles at a time on highway. I currently have 4100 miles and the display shows no oil consumption yet. Wish it had a dipstick though.
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Old 01-10-2014, 03:18 PM   #12
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Ditto. Briefly had a '13 3.0T that had chronic carbon drool. Knock on wood, but this has been a non existent issue with current TDi.
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Old 01-10-2014, 03:22 PM   #13
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This car is typically driven 12 miles at a time on highway. I currently have 4100 miles and the display shows no oil consumption yet. Wish it had a dipstick though.
You do know you can buy one, right?
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Old 01-10-2014, 03:28 PM   #14
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This car is typically driven 12 miles at a time on highway. I currently have 4100 miles and the display shows no oil consumption yet. Wish it had a dipstick though.
Once it's baked on, it can't be chemically removed (other than perhaps concentrated sulfuric acid and/or 30-40% hydrogen peroxide which will ruin your metal). This carbon is the same **** that coats the intake valves of DI vehicles.. Shaky dealers will try to sell you snake oil that will cure the intake valve carbon, but it's a total and complete waste of your money. The ONLY way is mechanical (hand scrubbing).

In the case of the exhaust pipes, if the carbon is old and baked, Never-Dull is a lot of work but at least it won't scratch the chrome plating. It comes in SECOND PLACE to Blue Magic and #0000 steel wool, which is the best.
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Old 01-10-2014, 03:38 PM   #15
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This car is typically driven 12 miles at a time on highway. I currently have 4100 miles and the display shows no oil consumption yet. Wish it had a dipstick though.
Ours is driven short to moderate distances with an occasional longer haul. I'll be keeping an eye out for build up but I think it would have appeared by now. Good luck with getting a solution to your issue.
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Old 01-10-2014, 03:52 PM   #16
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You do know you can buy one, right?
a dipstick? no I was not aware of that. Do you have any info?
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Old 01-10-2014, 08:13 PM   #17
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a dipstick? no I was not aware of that. Do you have any info?
ECS tuning have it.http://www.ecstuning.com/Audi-Q5-Qua...ick/ES2093747/
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Old 01-10-2014, 08:28 PM   #18
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Re: dipsticks you might want to read through this thread as the lengths / parts can vary.

http://www.myaudiq5.com/index.php/to...pstick/unread/
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Old 01-11-2014, 04:22 AM   #19
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it's what Elevens sez: it's the toxic crap created by the DI engines. It's very evident on both our cars.

I've found that you've got to attack it every week when the car is washed. Then removal isn't too bad. I treat it just like the 5th wheel and use a bit of wheel cleaner and a tooth brush to lift the stuff off. If it's hasn't been cleaned for a long time, you will need to attack with the #0000 steel wool and some type of cleaner or polish. Frequent cleaning is mandatory to keep it looking as good as the rest of the car.

I've got a dozen different metal polishes in my basement and have had measured success with all, but nothing truly impressive. Someone over on the detailing site suggest the Chemical Guys' product called Metal Shine Extreme Polish & Protection for Metal. I bought a bottle of this six months ago and have been really pleased with it in a number of applications. And it does appear to control the build up of the toxic goo in the following weeks and I can't report that with any of my other polishes.
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Old 01-11-2014, 04:57 AM   #20
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Actually octane can effect it. Not sure if Audi does this but many cars are programmed to add fuel if it detects knock, and by running slightly rich it can leave deposits on the exhaust tips and the back bumper of the car. They really do need premium if you are going to push it at all. Under a load it could just be throwing a bit more fuel.


I do want to try the wd40 trick. Never done that one.
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Old 01-11-2014, 04:57 AM
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