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The fuel filler cap itself can't be locked, but the outer flap locks automatically to provide security when the car is locked.
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YOU really don't have any recourse; the car is out of warranty. You could seek legal action, but I doubt you'd have much luck.
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YOU can have it serviced by any of the above. The Mercedes dealer will do the service by the book and most likely charge the most, but you'll feel pampered. The European car specialist will also service it by the book and charge less, but you probably won't be pampered by the service staff. Often these specialists are former employees of dealerships who have branched out on their own so they're fully trained and experienced. In this case, look for someone who specialises in Mercedes-Benz. At the same time, your mechanic may have no problem servicing your car, but if he's an all-rounder, he may not have specialist knowledge. That said, if you feel comfortable that he is a competent mechanic, and you trust him, stick with him.
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