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Old 04-15-2016, 05:43 PM   #7
Paul
Porsche "Purist"
 
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Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
Garage
Heat range, 6 is colder than 7.

Heat Range Conversion Chart

http://www.sparkplugs.com/Data/uploads/Charts/Bosch_Numbering_System.jpg
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.

Last edited by Paul; 04-15-2016 at 05:47 PM.
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