I would avoid monark brand also....couple members made a good argument to avoid them

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Reporting in!

Yes, do avoid Monarks. "Made in Germany" might as well be a misnomer...I've had them burn out easily on me, but not break off (thankfully). I've been using Bosch now for a little while and they seem to do the job just fine.

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- 1979 W123 240D 4-speed, 390k miles

'92 300D has Bosch GPs because I found them on sale. No problems thus so far and 20K miles and counting since I've put them in before I bought it. "Anka" the '99 E300 will be getting Beru plugs because I pamper it and don't beat it like the '92.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

I've got Monark injector nozzles on my 300SD's but that might be a different can of worms..

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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Blew #5 a Bosch glow plug after 16 months.

Replaced it with a Beru and 5 months later all is good.

I will not go back to Bosch glow plugs.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250

The only units I will use are "BOSCH" or "BERU" brand.

Desperation may force me to use other junk for a few days = only long enough for "BOSCH" or "BERU" to arrive...

Most other brands expect three months (or less) service before failure.


.

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ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

I found 1 of 6 Monark glow plugs were dead after 30k miles, installed by previous owner. Replaced all 6 yesterday with some made in France Bosch plugs ($8/ea Ebay) we'll see how long these last. I didn't have a spare intake manifold gasket on hand so just used RTV instead. I'm not sure if 30k miles is good or bad for glow plug life but most of my miles have been highway long distance, I don't even fire up the engine half the days since I can walk to work. The one down side with the Bosch plugs is they're 11v vs 11.5 with the Monarks but these plugs only have to last me until summer when the #17 head is going in.

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CENSORED due to not family friendly words

monark injector nozzles......great....

anything else monark.....runnnnnnn....

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good question on the Berlit branding and all.......i too didnt find much useful info about that, i intend to look into it further when i have some time, and i'm also ordering a few more sets of these, so i have extras laying about as needed......he even warranty's them for a year, but for the price i wont complain......as for how long they last, that we will see......the plugs have a part number but no "made in" markings.....the boxes were all Dänisch market packaging.....i have the one extra new one still (only 4 on a 240 ) so later i'll make some HD Webcam pics of the new glowplug and the packaging, to support further research

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-Justin

I believe in extreme automotive perfection whenever possible.......there is no such thing as "It doesn't matter" !!!

1985 300 CDT - 287k miles

1980 240 D - 340k miles

With extras !!

http://facebook.com/BenzDieselTuner

http://facebook.com/SWFLAlternativeFuelsClub

http://facebook.com/SWFLBenzClub

http://SWFLBenzClub.com

1995 E300D/316K miles.
Bought a set of Bosch from ******** Arizona, 110K miles ago. Recently the glow plug light has stopped coming on. Now the light comes on sometimes for a few seconds when the engine starts. Don't know yet if it is the plugs, controller or what. I guess 110K miles is good for a set of plugs but I honestly don't know how long they should last. Also I think I may have overpaid at ******** Arizona. Cost me $117 for a set in Sept of 2006.

I agree that the Autolite plugs are junk but when they Don't offer a comparable brand at a price which is acceptable , what is one to do?
You would think that these big companies would have a better product review process before introducing a new product. Companies like COSTCO has that process figured out..... why is it So different for others to follow.
I know fir a fact that Auto StoreZ has that problem Big Time.....Thier Mato is....
" If you want to continue to buy these parts as these prices then You can wait in line like the rest of them" That's right out of the Home Office in Memphis. I know I use to work there and their product line shows just that. .... they Just Don't Care Period .......
Capt. Obe
Product Analyst and Development
Precision Motor Works LLC
USA

I dont usually agree with brand bashing, but my experience wuth Autolite is bad enough to go with alteratives at any price. On my 190d turbo, it's too difficult to change plugs to risk premature failures.

X2 on my 617.952 it only tool 6 months of use in Southern CA use for the tips of 2 of the Autolites to swell up enough I was worried I woul not get them out of the head (and that was after the Injectors had been rebuilt so they were not the cause).
I have seen other pictures where it looks like the tips of the autolites exploded.

Then I installed the next worse Glow Plugs which were Monarks. Some of them lasted only a year before 3 failed. But, at least the tips did not swell.

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84 300D, 82 Volvo 244Gl Diesel

Has anyone tried Denso or NGK glow plugs in these engines?

Sixto
83 300SD

I don't remember trying them but my experience with spark plugs would lead me to be comfortable purchasing either brand.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.