plumber212

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.

sarchib

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.

ELEVENS

You do know you can buy one, right?

ELEVENS

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.

Q5 Bob

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.

plumber212

a dipstick? no I was not aware of that. Do you have any info?

amkmeco90

ECS tuning have it.http://www.ecstuning.com/Audi-Q5-Qua...ick/ES2093747/

arrtewwx

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/

uberwgn

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.

1LEThumper

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.