I am preparing to do a full tune up on my w201 and was wondering if there is aany known adverse reactions with using resistor spark plugs vs. non-resistor spark plugs for my car.

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1990 190E 3.0L

if you do a search on this you'll find a lot of arguing and such back and forth between the two sides.

I just stuck with non-resistor types like my manual called for.

Denso T20EP-U
NGK BP5-EFS

******** has them or

http://www.clubplug.net/ stock number 5031

You might even be able to get the NGK's at your local Napa Auto Parts.

__________________
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

Me too!

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

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.

Non resistor plugs because the wires have resistance. Thats is what I have read online AND on my wires (8 ohm I think). So if you have wires with no resistance (well very low) then resistor plugs.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car

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

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95 E320 Cabriolet, 159K

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.

and some dealers wont have the non-resistor ones in stock, they may give you the bosch resistor plugs regardless and just tell you that they'll work no problem.

Get them online, I think Fastlane even has some...

__________________
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

Well, it's worth trying dealers if your local auto parts store doesn't have the right specification plugs. Inspect them before buying first, of course!!

I've got my plugs at my local parts guy at the dealer - Bosch H9DC0 for my '89 190E 2.6.

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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg

I got H9DCO non-resistor for $3.29/each at my local dealer. Go there first.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k