Another thing you must put into searching, is that there are two types of glow plugs.....pencil upgrade and the standard ones that post late 1979 w123s use....while the people who agreed that monark glow plugs are perfectly fine....were they commenting on the upgrade plugs or the standard? I am not starting an argument of which brand to use, use what you like and I will use what I like.....but take your own advice while research and take into account the year if the post plus what type of plug they used.....as the upgrade plug may be assembled in a different factory then the standard.....another interesting factoid, if monark glowplugs are so high and mighty, then why are the Bosch upgrade plugs sold out everywhere?

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