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Spark Plugs for (Classic) W124

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davegt's picture
Newnan, GA
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1999 ML320

Seems that I keep reading about folks looking for non-resistor plugs for their W124 cars. Is it that hard to find spark plugs?

Not that our 95 E420 needs any for awhile, but what plugs are recommended?

Seems that even Autozone around the corner has a selection of plugs to fit the car....:confused:

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normajean's picture
Beaverdam, VA
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1983 300CD
Re: Spark Plugs for (Classic) W124

Non-resistor plugs for almost any older Benz are important because the Benz harness has the proper resistance built into the plug connectors. Adding a second resistor will affect the spark characteristics. I don't know if Benz still uses the resistive plug harness on the newer gassers.

Most other cars these days use non-resistive plug wiring since it is less expensive for them.

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davegt's picture
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Re: Spark Plugs for (Classic) W124

Hmmm...so the 95 E420 should have non-resistor plugs. Where would one purchase those plugs?:confused:

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Ferdman's picture
Chester Springs, PA
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Re: Spark Plugs for (Classic) W124

Dave, you can order Bosch F8DC4 spark plugs from benzautoparts.com

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Fred Hoelzle

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davegt's picture
Newnan, GA
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1999 ML320
Re: Spark Plugs for (Classic) W124

Thanks Fred, they are available locally and certainly inexpensive.

I know Robby has run the Platinum +4 on his E320... would they also work on the E420?

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BuyMBparts's picture
Atlanta, GA
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Re: Spark Plugs for (Classic) W124

I have the F8DC4's for $1.85 each.

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Ferdman's picture
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Re: Spark Plugs for (Classic) W124

Dave, platinum plugs in your E420 are a no-no. Stick with the Bosch F8DC4 spark plugs.

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Fred Hoelzle

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Re: Spark Plugs for (Classic) W124

+1, stay away from the platinum plugs! I also like to bump the gap up to around 40-42..helps make the idle Nice and smooth!

Check over your cap/rotors..they take some abuse on the 119. Ohm out a wire or two while you are @ it... the way the wires are run they are prone to arcing if resistance gets too high.

Jonathan

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Tom Hanson's picture
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Re: Spark Plugs for (Classic) W124

I don't quote prices here, as requested by Club management, but I can say that we're competetive. Do stick with the W8DC4 plug.

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Prior MB cars: 2010 ML350 Bluetec, 2003 C320 Coupe, 1986 300SDL, 1971 300SEL 6.3, 1973 450SE, 1959 220S, 2011 C300

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pch2021's picture
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Re: Spark Plugs for (Classic) W124

Bosch platinum plugs are designed for use in the following vehicles:

Lawnmowers
Office chairs
weedwackers
small lawn gnomes

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Pierre Hedary
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Re: Spark Plugs for (Classic) W124

My SLK calls for platinum as do most of the cars the last ten plus years or so.

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Len

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Re: Spark Plugs for (Classic) W124

Platinum plugs should work just fine ... but ... they were developed for long life as compared to conventional copper plugs. For our cars (I have an '88 560SL) with aluminum heads I find it theraputic to remove, inspect, sandblast and reset plugs once per year anyway. I find many disagree with that practice but I have the horrors of finding a plug frozen into that aluminum head after being left in place for years.

I use copper core plugs since periodic removal offers the opportunity to change them if deemed necessary and they cost a lot less plus are the original factory recommendation anyway.

Bottom line is, I agree that platinums will work fine. Just don't get suckered into any kind of multiple electrode plug since that is just a sales gimmick. The laws of physics prevail and the spark will jump the point of least resistance at all times.

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