I have the option to purchase a 2000 s4 for 3k. It has a blown head gasket and turbos might be blown as well. It was chipped a couple miles back. The seller is a great personal friend of mine so i kno hes being honest. He said tubos might not be blown but a sensor could have gone out. I need to kno what the price is to have the engine rebuilt bc antifreez is leakeing into oil. How much for a shop to have it down and how complicated is it to diy. I need a price estimate to get this car unning again so i can figure out if i can afford to purchase it. I will appreciate any help/info. I am new to audi but not new to cars or diy. Thank you for helping.