A6 Quattro Sedan V6-3.0L (AVK) (2002)
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For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of parking heater/auxiliary heater at noise insulation.
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Loosen mounting parts -1 to 4- and remove noise insulation.
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Replace O-ring at guide tube for oil dipstick and insert guide tube into hole in oil pan (upper part).