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  #1  
Old 01-21-2011, 01:41 PM
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Resistor or non-resistor plugs

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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Old 01-21-2011, 01:53 PM
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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.
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  #3  
Old 01-21-2011, 01:58 PM
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Quote:
Originally Posted by JamesDean View Post
I just stuck with non-resistor types like my manual called for.
Me too!
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Old 01-21-2011, 03:07 PM
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i have resistors in..... bosch copper core....
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Old 01-21-2011, 03:58 PM
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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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  #6  
Old 01-21-2011, 04:32 PM
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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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Old 01-21-2011, 04:34 PM
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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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Old 01-21-2011, 05:42 PM
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Originally Posted by lee polowczuk View Post
i have resistors in..... bosch copper core....
Maybe that's why you're having problems (from another thread) immediately after changing plugs.
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Old 01-21-2011, 07:07 PM
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Get the plugs from your Mercedes dealer. PepBoys doesn't carry Mercedes parts.
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Old 01-22-2011, 04:23 AM
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Quote:
Originally Posted by lkchris View Post
Get the plugs from your Mercedes dealer. PepBoys doesn't carry Mercedes parts.
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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  #11  
Old 01-22-2011, 07:26 AM
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This topic

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.
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  #12  
Old 01-22-2011, 12:28 PM
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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...
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Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
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  #13  
Old 01-22-2011, 02:03 PM
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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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  #14  
Old 01-22-2011, 02:38 PM
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I got H9DCO non-resistor for $3.29/each at my local dealer. Go there first.

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