i have resistors in..... bosch copper core....

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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]

I put in resistors and non-resistors, noticed no power difference. I bet on a dyno there would be very little, if any difference.

Just stick with copper core and stay away from the Pt + the four prong deals

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Mercedes says non resistant plugs. I personally think arguing with someone who has been making cars for 125 years is a little redundant.

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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.

i don't believe in the lord! He's never bought me a Mercedes Benz.

Maybe that's why you're having problems (from another thread) immediately after changing plugs.

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95 E320 Cabriolet, 169K

Get the plugs from your Mercedes dealer. PepBoys doesn't carry Mercedes parts.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

I agree. I think a lot of you on this forum are very smart and have helped me a great deal, but in a situation like this where everyone is saying something different, I'd rather just bend over and go get raped for a few extra $$$ by the dealership. At least that way I know that I am getting exactly what my car was engineered for. Resistors may work, but I'm not willing to try it because I only have the one car and not enough knowledge to fix major eff ups with the engine. ;-)

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1990 190E 3.0L

is almost as popular as an oil thread.

Non-resistor copper core plugs are specified for our cars and should be used. The comment regarding wire resistance is valid. I had valve seals replaced on my M117 engine a year ago and the very knowledgeable MB specialist independent installed Bosch resistor plugs without me asking him to do so. I told him I would go ahead and try them. The car ran and started o.k. for about 6 months then performance started to fall off. I replaced those plugs with NGK BP5ES, a copper non-resistor plug that is commonly used in place of the Bosch non-available plug. Performance is back to the way it should be.

The comment regarding sourcing plugs from Pep Boys is nonsense. Mercedes Benz does not make things like spark plugs. Back when the proper Bosch OEM plugs were available you could get them from Pep Boys. Going to the dealer for every minor, non specific part will only enrich the dealer and make you poorer.