I had known that any resistance above .5 was a sign of a glowplug going out, and of course an infinite reading meant it was burnt out completely. I didn't know about the other check using the block. I'll have to check that tomorrow or Sunday.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member