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#1
03-10-2004, 09:33 AM
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380SL - What Is Correct Spark Plug?
My local Advance Auto Parts store shows Bosch 4220/WR9DP as being the correct spak plug, is this correct? These are apparently factory gapped plugs, is this also correct?
Thank you. Last edited by ezrider; 03-10-2004 at 10:43 AM. 
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#4
03-10-2004, 10:36 AM
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The recommendation I have seen (and the ones I use) are Bosch H9DC, which are copper. A lot of people say that the platinum plugs are bad news.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#5
03-10-2004, 10:45 AM
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Chuck,
What is the difference between the OE W9DC and the H9DC? I pretty much would stick with copper as well.
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Rick '85 380 SL (sold) '85 Carrera Flatnose '71 280 SL Signal Red/Cognac
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#7
03-13-2004, 07:41 AM
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For these older engines, the copper plugs give a cooler but beafier spark.
When I say beafier I mean, the copper tip transfers the stored energy from the coil with a wider spark. The copper tip also takes a little longer in time to transfer all the energy from electrode to anode. This allows more leeway in your tuning to burn all the fuel in the cylinder. The platinum plugs work great on true fuel injection systems, where the atomized fuel spray is shot directly into the cylinder. This places better fumes inside the cylinder chamber. It is the fumes that ignite not the raw gas.
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1983 500SL Euro
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#9
03-13-2004, 10:25 AM
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I would recommend the Bosch copper non resistor. I had fouling and subsequent stalling problems with platinum plugs. According to the local Mercedes dealer, the plugs should be non-resistor.
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1983 380SL 1995 C280 1995 S500 coupe 1990 Mazda Miata 2004 Suzuki Hayabusa
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