The Bosch platimun + plugs will get the job done for 30K-45K miles, but after that will start causing problems.

The OE quality will last 100K, on some engines. IF fact I just saw a 2001 C240 with 125K & the original plugs (Beru not Bosch). NO misfires!

I would think that with 1.5-2 hrs involved & only a small savings in cost for the aftermarket plugs that you would go with the OE plug.

Bosch plug is FR8DPP33 & Beru is 14FGH-8DPURX2

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