You go waybomb Mercedes gets a bad rap anecdotally because German's don't know how to make cup holders and Mercedes drivers are more particular than others. However that being said all that a large majority of women care about is will it get them from point a to b without worries. So I can see why the sister would be fed up with that car. If you are an exec and you demand flawless performance lease one or trade every 2 to 3 years. That is really the only way you are going to avoid these kind of issues in any car but that also greatly increases the chance that you will get a lemon!

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory