I recently had my car serviced. They replaced oem audi canister purge solenoid and oem audi updated purge solenoid hose assy. They drained the intercooler, there was a quart and a half of oil in it. They said the turbo seals are leaking and that I needed a new turbo. I called audi, the mechanic said no way, all you need is a new valve cover assembly. I need an economical solution for this but I need it to be safe and reliable for my 16 year old daughter who lives out of state. Advise please?