I stopped by my dealer - Porsche of Fremont - today to check something. All was fine, but while the car was on the lift, the mechanic who always services my car, decided to tap the undercarriage covers and heard loose rocks inside... He knows this to be a common occurrence. The rocks are sucked in on the road via the NACA ducts. He pulled the cover out (the rear one covering the transmission) and a dozen small pebbles/rocks came tumbling down. It's not a big deal, as I never heard any rattling, but something to check if you hear rattles, or when your car is serviced.
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I changed the oil in my wife's '02 turbo Audi TT myself and if you've done that yourself, you know there is a large panel under the front of those cars that has to be dropped to do the oil change. It was fairly well buttoned up when in place but you could do a geological study on your driving habits by analyzing the rock collection inside that thing! Same with my '96 C4S.
It's not entirely **** to pull these panels off every couple of years to inspect things up inside there--and then clean the panels, wax them, and reinstall them.
Dan - Is this a similar degree of "attention to detail" as removing the rear bumper to wash and wax the frame behind it???
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