Really? Try some silicone rubber conditioner on the door seals. Something like this https://www.amazon.co.uk/Sonax-34000...s=gummi+pflege but there are different products available in different formats. Also you can set HVAC fan to higher speed to keep positive cabin pressure nad prevent air and dust from entering in the gaps.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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