I know they're a good product made by good company who meets or exceeds oem specs. I'll be really surprised if the counterman could tell you the difference. If going in my collector 16v or my older MBs, I always buy original stuff. If putting them into a daily driver, I'd buy the Napa ones and not worry about it. I've seen Bosch failures too.

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- Brian


1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600