I figure while I have this car apart for the fuel lines and such, I should do the glow plugs just in case. Is there any real difference in reliability or longevity of the oem plug vs the Bosch, who likely makes it and puts it in a Mercedes box for them?

Also, which reamer do you guys like the most? I figure plenty of time for some Kroil to soak down in the threads, and ever so slightly back and forth on the ratchet to get them out, it's worth doing now.