What I was actually trying to get at was some comparative experiences with glow plug longevity, German, French, or trashy American chain parts store...whatever. Is there a brand/providence that folks swear by because they last a long time (and I am sure there are some opinions)? And, is there anything other than manufacture quality, or lack of, that contributes to their demise. The tip of one of my Bosch's was burned off, the others were just non-functional, except that one.

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1983 CD
1958 Studebaker Packard (being resuscitated)