So i just started looking up glowplugs for the om602. Bosch sells several different versions all for the same application.

You have to be careful with this. This engine has an afterglow relay, meaning that the plugs stay on for awhile after the engine starts. The plugs are designed to limit temperature in the afterglow cycle. The OE Beru plug (GN858) is NLA under their own brand in North America, although Mercedes plugs may be made by them. The correct Bosch number is 0250201055. It's physically the same size as the earlier non-afterglow plug, so make sure you get the right part.

cool thanks, how important is having the reamer tool and what is the size for these plugs?

The thread is M12x1.25. I have never used a reamer, but that's not a suggestion.

Thus far, I've always used Bosch...but I've become disenchanted as they seem not to last all that long. So I'm switching to Beru. There is a Beru available for the OM602. Bought them recently for a friend's 89 190D. Sold as W0133-1631189.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

heres a link for monarks, ive had good luck with them, add Mercedes source in the astriks, its blocked for some reason.


https://**************.com/store/1990-1993-300d-25-and-1989-190d-25-monark-glow-plugs-set-5-glow-plug-removal-manual

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2011 e320 cdi (132,000) current
2005 Jeep CRD diesel--2.8L (138,000 miles) wrecked, insurance took
1993 Mercedes benz 300D 2.5 Turbo Frybrid powered. (336,000 miles) wrecked and sold as parts car
1990 Mercedes benz 300D 2.5 Turbo (170,000 miles) wrecked and sold as parts car

Check out my Frybrid Vegtable Oil Conversion at http://1990300dfrybridconversion.shutterfly.com/

Changed all five GP two years ago now. i used bosch duratherm. reamed out quite a bit of carbon build up when i did. Zero glow plug issues since.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"