I have about 17,000 on my blue '03 MO SL front wheel drive. It's a great fun vehicle. But, I've noticed several times in the last month when I start it in the garage, where there are no outside noises to interfer, engine cold, I hear a brief grinding noise just as the engine starts. Not like a starter motor noise, more like shifting a standard transmission with a bad syncro. Doesn't matter if the A/C is off or on. What in the world could that be. Thanks