Eating glow plugs is NOT NORMAL (too much iron in the diet). Seriously though, if you were consistently losing a glow plug in one cylinder consistently, it would make sense to check injector pattern and look at prechamber condition.

However, you've lost a plug in nearly every cylinder now, and in VERY short time. I'd be looking at your glow plug system somehow remaining energized.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)