the plugs on the 260e had 63k miles on them... i have only had the car for the last 3k.

anyway.. i had some Bosch resistor plugs.... thought i had bought the non-resistor...but they had run out..

bottom line is...i changed them out today while waiting for the oil to suck out..

the car runs fine..

the others were Autolite... the gap was huge...some of the threads had some oil on them...i guess that might be consistent with the need to do valve stem seals.

the plug tips seemed to have a little ash on them...

anyway the cars runs great....

i think the number is HRD9C.... it's the right plug, except for the R.

i still have 6 non-resistors in the shop for the CE

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

The HRD9C were the ones I had in my CE for 3K miles without any problems, then I read a lot of threads here that they can damage the engine, so I chickened out and replaced them with non-resistor ones bought at Autozone (Autolite).

Now Lee just did the other way round .

__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

I'd hunt down some non-resistor plugs. You should still be able to find NGK's in NR. These ignition systems can handle a big gap, however with the high mileage I would run something on the tighter side to help any fouling in the future.

When was your cap/rotor/wires done last? I often see that overlooked on M103's.

Jonathan

__________________
Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
Follow Us on Facebook!
Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta

wires were done at the same mileage..

car runs great....when it stops running great, i'll get nr's.

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

Well, once that happens best order up a new set of wires/cap and rotor as that's what's getting worked Over time.

Worst case you'll be ordering up a new coil as well.

Jonathan

__________________
Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
Follow Us on Facebook!
Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta

you guys are scaring me a bit..

i'll get some autolite 104's at autozone....

like i said i have 6 bosch no resistors...but i will save those for the CE

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

Instead of HD9CO or HD9C Go with NGK. Go to www.clubplug.net put in part# BP5ES pay $1.80 a plug and small shipping fee and in days you got plugs, gap is .032 put them in and your car purrs. Its simple

Put in part number in box on upper right side.

If you go by model / year it recommends a resistor plug & you know better than that

But isnt the correct part # BP5EFS? The F is missing.
The 190 with the 2.6 litre engine M103 uses the above.
link:http://www.ngkpartfinder.co.uk/car_commercial_extra.php?id=4072

__________________
Tom 2010 C250 4-matic Sport (Canada)

I used this Bosch-NGK crossreference
http://www.clubplug.net/bosch_ngk.html

and had BP5ES plugs infor six weeks and car runs great.

same info found at url below as go2sl pointed out.

pro mechanic here named "autozen" - 30 yrs. expereince on mb's said he's used them from the get-go.

BP5EFS

http://www.spark-plugs.co.uk/pages/technical/boschd6b-w4e2.htm

__________________
'91 300-SEL