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Join Date: Jun 2001
Location: Sweden
Posts: 5,758
Originally Posted by hobieboy View Post
I got confused about NGK & Bosch numbering a lot, but I thought for NGK, 7 is hotter than 9?
Yupp. NGK 7's are hotter than 9's. Bosch is other way around.

Porsche started with recomending NGK 8's in turbocharged cars to be on the safe side, which went down to 7's as they noticed that owners weren't driving them hard enough to "unfoul" the plugs.
Thank you for your time,
Old 03-21-2008, 01:18 AM
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