A4EverQuattro

I can recommend Unicorn Motor Development in Congleton if and when the time comes. I had my A4 40TDI done and so far I am impressed. Custom map on the ECU & TCU.

Doesn’t AR6400-D chemically clean where as Dipetane is a combustion enhancer and doesn’t really ‘clean’ per se. For cars already a bit clogged it seems AR6400D-d is the better choice? It also cleans the turbo and cat. AR6400-D is also only used twice a year dependant on mileage. The 6900-D is a different kettle of fish all together, it boosts Cetene levels as well as clean and is an every tank of fuel thing. I use both for the same reason as you, lots of short trips. Each to their own though 👍 p.s I do like the mpg increase claims though. Archoil do state improved mpg but looking at reviews in the site some people claim 10mpg increase which is a lot!

Good news! It does seem Audi were taking the Micky. £1500 is a lot more palatable than £5k 😅 Definitely worth some preventative maintenance. I also started using Winns Adblue crystallisation treatment as well. All this emissions gubbins creates a bit of a headache so I figure anything that can be done to offset an expensive bill is worthwhile. Like you, I plan on keeping the car for a long time (even as a second car down the line).

Just wondering where you are up to with this one? Seems very unlucky at only 52k miles. Hopefully you get some joy with cleaning it out. If you do - I can and for future maintenance, I highly recommend Archoil AR6400-D. Its a DPF cleaner with very strong detergents in, design to be used roughly every 5000 miles (it also does your turbo and cat). Many people have found this gets rid of the warning lights all together. I use it in my 40TDI Quattro on 54.5k miles, which feels much better post usage (uptake, smoother etc). I also use Archoil AR6900-D which boosts cetene and cleans as well. Just a thought!