Sure would love to got a set..
thanks

Can you tell me where these are mfg'd?

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Steven
1989 260E (276K miles)
1995 E320 (50K miles)

they are made in germany

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1989 300ce smoke silver / brazil, in a constant state of flux ~~~

No need for the H9DC0....though my dealer still has them for about $3.20 apiece....

I just use NGK resistor standard style plugs, they work great. Car runs smooth and strong, and has been getting between 21 and 25mpg. (300E) I've had them in for many thousands of miles now. 0 issues at all. About $16 for a set of 6

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I use the non resistor Beru plugs for my 300se /103 engine. Incidendently most are available overseas at $ 2/plug.

I do not fully understand the critical need for the non resistor plugs .Is that due to the fact that the resistor is already in the rotor.

mak

just trying to help...call SparoMobile in Downers Grove Illinois 630-963-8410 and tell them your make and model and the plug you are looking for and they will look it up and tell you the new replacement plug. I live about 5 miles from these cats and have used them for years....they know the skinny. I just did this last summer and they have this giant cross reference database and will tell you that, no that plug is no longer made, it's superceded by Bosch plug blah blah blah... and I say fine, how much...and they tell me...these guys know their stuff....and they have it!
It's awesome...give em a holler and at least you will be given good information I guarantee...tell em Cliff sent ya...

Supposedly....but I've found 0 running difference with resistor or non-resistor plugs.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Bosch Non Resistor Spark Plugs
http://www.peachparts.com/shopforum/showthread.php?t=181047







Have a great day.

__________________
ASE Master Mechanic
https://whunter.carrd.co/

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
2003 Volvo V70

https://www.boldegoist.com/

I was just able to get a set of 6 of the H9DCO Bosch plugs from *F*C*P*E*u*r*o .com. Was very surprised to receive them to say the least!

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

In my M103 experience going back to 1988 I found that resistor plugs created a slight idle roughness (that I could feel) caused by excessive misfires, and this also increased HC during emission testing to the very ragged edge of the cut points back with the old two speed idle/2500 rev no load test that was used in California prior to ASM dyno testing.

OE equivalent M103 caps and plug wire boots have 2K RFI resistors built in. Adding additional resistance alters the voltage wave form and lowers spark energy, which is what causes the increasing misfires and high HC.

"Lean" idle mixtures (stoichiometric) and relatively high exhaust gas dilution due to the M103's relatively high overlap are tougher to ignite than rich, dense mixtures (WOT), and need a high energy, long duration spark.

In my experience M103s need non-resistor plugs to operate properly including emission tests.

Duke

Just purchased a dozen Bosch H9DC plugs on eBay, there is a seller who sells old stock for anyone who’s interested.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

I got a "invalid link" message when I tried to open your link.

Duke

That can happen with a ten year old link!

I remember wiper blades for 50˘, Casite air and oil filters for $1.

Cars were cheap to maintain through the 70s and 80s. Inflation doesn't account for many of the prices nowadays.

NGK makes much higher quality spark plugs.

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CENSORED due to not family friendly words