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I'm coming back to the Audi world (shouldn't have left) with purchasing a 2017 S6 4.0T. The S6 has 47k on the odometer, the carfax shows routine maintenance, the vehicle originated from New Jersey, and a recorded accident being hit in the rear. The car drove well and the transmissions didn't have any issues. The car looks to be in good condition but the engine area has some concerns for me. Has some oxidation on the valve covers and what looks like wastegates with oxidation and rust. I wanted to get expert opinions before purchasing the S6. What issues would I need to look at with the 2017 S6 and what immediate things would I need to change/maintenance when I purchase? Thank you for the help getting me back to the only cars to own. Sorry for the poor quality the salesman sent me the pictures.