If it is a minor sweat and it doesn't bother you, do not touch it!! If you do want to go after it, a tech can re-seal it for you if he has the special tools.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM