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#1
04-09-2004, 09:04 AM
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Bosch +4 plugs
Anybody have any experience with these new +4 Platinum sparkplugs from Bosch in a mid 80's 500SL or other? Seems like they should help.
Thanks, Mark 1983 500 SL 1970 MGB 2000 Acura 3.5 2004 Toy Sequoia 
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#2
04-09-2004, 06:07 PM
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The collected wisdom seems to be that the copper HD9C's work better. Lots of posts, try a search.
__________________
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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#3
04-09-2004, 08:42 PM
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Thanks Chuck, I'll research it . Sometimes the older engines lik ethe parts they were designed for. I'm also looking into halogen upgrades for the headlights. I realize that some of these "white light " special may be asking for trouble in the overstressed wire/relay category.
Performance Products has suggested a Sylvania "Silverstar" as a direct replacement for my Euro lights without any relay/wiring mods. I'm not so sure. I wonder if the Hella upgrades are safer....
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#4
04-09-2004, 09:12 PM
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Also worthy of note is that the center electrode of a +4 has actually only a tiny little amount of platinum in it. Get one and have a look.
True platinum plugs, ones with an electrode comparable in size to the electrode on a copper plug, are available for most cars, but they are going to cost you about $30 each.
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