Damn, that sounds more like an old Kia problem. I would ditch the car if I had to provide it that kind of pampering. Shame on Mercedes for cutting corners on the newer cars. Is this due to more green party influence (i.e. water-based sealants, etc)? My 380SE has no body rust at all.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma