The part # for the Alternator (Automatic trans) is 6H903016L and it's made by Bosh. [Europaparts](https://parts.audiusa.com/p/Audi_2012_A4-Base-Sedan-20L-AT-Quattro/Alternator/48001649/06H903016L.html) sell's it for $499.95 (OEM).
Reviews of spare parts for Audi
I run EBC Redstuff pads, the brake dust is very minimal.
I like Akebono ceramics.
Got a 2014 DSG and find around town it’s 22-26 mpg but 35 on long motorway runs.
I specced it when I blew the turbocharger on my MQB Audi S3. Audi wanted almost $29,000.00. It turns out that all I needed was a new turbocharger and a cleaning of the impeller shards from my intercooler.
Not sure your price range, but I have Pirelli Scorpion A/S Plus 3’s on my Q5. Really quiet as far as road noise. Love em.
I use Zimmerman rotors and Hawk HPS pads on all my Audis.
I got EBC red pads from ECS for my SQ5 I got 40000km to a set of fronts/rears but man they were shot when they came off.
Had to get water pump done on my A6 at 90000km / ~56000 miles. Was a couple years older than yours at the time, but still felt pretty low mileage to me.
In my old Audi, I had a non-OEM battery and I did the +1 in the serial number trick. That battery failed in a couple of months. I honestly think it was a bad unit.
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