I have 136K miles on my 2008 S6. It has the JHM catbacks but has now developed a leak at the Y pipes. I brought it to a muffler shop and they recommended that I replace both left and right Y pipes as well as an oxygen sensor, which will require dropping the engine - work they will not do because they “don’t have the manpower”. I will bring it to an independent shop. I found the OEM Y pipes on sale at Audiusaparts.com. My question for the forum is: If I’m going to drop the engine and have to pay for the labor costs, what else should I get done as preventive maintenance? From what I have read in this forum and other sites, I should:
- Replace 02 sensors
- Check the timing chain and timing chain guides
- Check the 4 seals at the back of the engine where the coolant hoses enter.
Am I missing anything?
Thank you for your help in this matter.