My car is a '94 530i clutch with 70K miles. The six-year extended engine warranty expired in late October. Just before that date, I asked Rasmussen here to test the engine for sulfur-related cylinder wear. I asked for the leakdown test. When I got the car back, the idle quality and "pressure distribution" tests had been done and were within specified limits, and so the leakdown test was not done. I let it go. Did I make a mistake?