I saw a comment on a youtube video for A4 oil consumption that Anti-Carbon XADO treatment when used by the directions effectively removed the carbon deposits on the piston rings. The person said oil consumption went from one quart every tank of gas to no burning in a tank. Someone please give it a try and report back!
It comes in a spray can or a tube. The tube you need one tube per cylinder, the can treats up to 20 cylinders.
https://xado.us/chemicals-and-fluids...ent/anticarbon

2010 Audi A4 Quattro, Check out my upgrade and maintenance videos Cars and Coding here: https://www.youtube.com/playlist?lis...4DHrYwEPid0aZb