spark plug BOSCH F8DC4 vs F8DC0 - Page 16 - Mercedes-Benz Forum
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post #151 of 171 (permalink) Old 02-14-2018, 11:12 AM
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something I read,looking in europe for sparkplugs,I find they run a colder spark plug there.Must be for the autobahnn. I might try them instead of my champion 12ycc,and go for c11ycc
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post #152 of 171 (permalink) Old 02-14-2018, 11:22 AM
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something I read,looking in europe for sparkplugs,I find they run a colder spark plug there.Must be for the autobahnn. I might try them instead of my champion 12ycc,and go for c11ycc
That is correct. For street use in USA, don't use colder plugs. If you are running NOS, or entering the Mojave Mile, then a colder plug would be a good idea.

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post #153 of 171 (permalink) Old 02-15-2018, 09:44 AM
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15 pages later, I am still confused if its okay to install R plugs.
I guess id find non R ones :P
No reason to install resistor plugs. The correct Bosch plugs are less than $2 ea.

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post #154 of 171 (permalink) Old 02-16-2018, 07:02 AM
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Arm Strong

I didn't realize anyone made a resistor-free iridium plug?
I like the cheap copper cores- I pull them to inspect and they are cheap enough to replace. Probably last up towards 60,000 miles, but I ussually toss new ones in @ 30,000 and the old ones look good.

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post #155 of 171 (permalink) Old 02-16-2018, 07:14 AM
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I didn't realize anyone made a resistor-free iridium plug?
These do not exist (at least not for M119 applications, if at all).


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I like the cheap copper cores- I pull them to inspect and they are cheap enough to replace. Probably last up towards 60,000 miles, but I ussually toss new ones in @ 30,000 and the old ones look good.
Exactly correct!!

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post #156 of 171 (permalink) Old 02-16-2018, 07:24 AM
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If I may add something to the great spark plug debate:

I'm using genuine Mercedes plugs, specifically part number 003-159-68-03. My coupe is running splendidly with them. They're French made with the proper flat base, had 14F-8DU4 printed on them which seems to mean they're Beru.
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post #157 of 171 (permalink) Old 02-17-2018, 03:51 AM
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Some plugs unscrew so that you can make a resistor free plug.Seen it on youtube.You unscrew it,dump out resistor material,then replace with copper part same size.
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post #158 of 171 (permalink) Old 02-17-2018, 03:21 PM
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I'm using genuine Mercedes plugs, specifically part number 003-159-68-03. My coupe is running splendidly with them. They're French made with the proper flat base, had 14F-8DU4 printed on them which seems to mean they're Beru.
Those are the current plugs sold by MB dealers, since the OE Bosch with the Star logo went NLA in late summer 2017. And yes, they are Beru plugs. Also available on eBay.

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post #159 of 171 (permalink) Old 03-19-2018, 02:28 AM
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BOSCH - H7DC0

they arrived and installed
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post #160 of 171 (permalink) Old 03-22-2018, 09:01 PM
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@Zamanumer .
All you have to do now is to get the same fuel they sold back in the 90'! This spark plugs will not run good on the fuel they sell now, did you know that?
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