Thread: OEM spark plugs
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nize nize is offline
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Join Date: Jun 2004
Location: seattle, washington
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i've said it before and i'll say it again. the bosch platinum plugs suck. why? because the center platinum electrode is so thin (like, thinner than a sewing needle) it wears out MUCH too quickly and ends up receding deep into the ceramic sleeve, which in turn ends up giving you a weak spark.

they're great for the first 5000 miles or so, but depending on how hard you drive they'll deteriorate pretty quickly. definitely not worth the money.

the ngk's on the other hand, have a very large platinum 'disk' that's embedded into the regular (copper?) center electrode, so they don't wear out as fast.

of course neither can hold a candle to the solid-platinum core racing plugs that both bosch and ngk make, but those plugs are like $50 each.

edit; here's a good article on platinum plugs;
'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!)
Old 08-14-2004, 07:39 AM
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