I changed my glow plugs Saturday evening....a couple of them didn't want to come out, because of the carbon deposits. I did not have a reemer, and so I just installed the new ones. Will this carbon buildup affect the life of the plugs? I changed them last November, and so they only lasted a year. At least one had stopped working, because the relay light would not come on and it was hard to start in the mornings. The reemer costs $46.20 at Performance Products - is it worth it?

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1976 240D
1987 560SL
2007 E320 Bluetec
1998 C280 (now son’s car)
1982 240D Manual - Sold