Bought some of that stuff you add to the oil, and let the car idle for 20-30 min, before you drain it. But how to go from there? Do you add new cheap oil and run it through again, (without idle) before you add what the car is gonna run with? I have seen the oil that comes out the second round, and it is all black and filled with sludge and gunk, but is it necessary?
a3 1.8t
a3 1.8t