Did you use Bosch F8DPER plugs. These are not the normal Bosch Platinum Plugs. You will find out when you pay for them. This is the plug that MB recommends.

MB specifically recommends against the use of the Aftermarket Bosch Platinum plugs.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician