Next time you do a timing belt just pull off the oil gear and check your bearings. I randomly decided to do that and lo and behold here is what I found. I also found out audi doesn't even offer replacements. Integrated engineering or Techtonics Tuning (where I got mine) are your only options. It sucked getting the front one out and I am definitely not replacing the rear one as I have no idea how you would get the old one out. It is way inside the block. Plus installing the new would be incredibly challenging. My rear one actually looked quite good. No noticeable wear. Just thought I would share.
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