Ok guys, I have an '84 500 SEC. Time to change plugs again. What do you think?
Bosch or Beru? Resistor or non. I'm looking for the best performance I can get from a gasser with 234,000.

After new injectors,seats,cups,dist. cap,rotor,coil,wires,all injector breather hoses,fuel pump,filter,and accumulator, she still stumbles alittle at warm start.

I can live with that. Just looking to improve mileage some. Gas just went to $3.64 gal. here in Sacto.

Off topic, I may need to sell her if my Jeep does not sell soon. Getting very dificult feeding three gas tanks at $70.00 a pop. (Trying to unload payment on the Jeep first.)

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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Of the 2 choices listed here:
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1XC0ZKQX922N0Z1LED&year=1984&make=MB&model=500-SEC-001&category=F&part=Spark+Plug
I would opt for the NGK's.
Btw., I don't think you really want resistor plugs.

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2007 C 230 Sport.

Thanks. Very appreciated.
What problems do the resistors for this engine create? Not that knowledgable here on plug types.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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My understanding is, because M-B uses plugconnectors that already have a specific resistance built into them, the engine does not like the additional resistance of a resistor sparkplug.
There are 1.7 million threads on this very subject floating around here.

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2007 C 230 Sport.

Manny...you rock!!! Thanks for the info.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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He, he, I give great advice,......from my rocking chair.

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2007 C 230 Sport.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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