I have no problem with a non certified technician working on my car. That will be me. The only time it would be repaired by dealer is under warranty for a major failure. I bought the car, sealed it throughout with Waxoyl to prevent corrosion. Removed the wheels to provide anti seize to hub and bolts. Sealed paint with "Ice". Added transparent "Bra" to protect paint. Purchased paper shop manuals. Found exhaust system is made from 304 stainless steel...Expect no problems from this car...Mercedes/Karmann build...enough said. Gary