w140amg Posted March 3, 2009 Share Posted March 3, 2009 I have read several post where LS owners purchased Iridium plugs. Are platinum plugs oaky to use? I purchased 8 Denso platinum plugs. Denso PK20R8 ND I also saw a parts listing of spark plug seals. Do I need to buy 8 of them also? Quote Link to comment Share on other sites More sharing options...
w140amg Posted March 3, 2009 Author Share Posted March 3, 2009 I also noticed that production date: 10/1994 to 7/1995 use 8 mm. 8/1995 to 6/1997 use 11 mm. Very interesting...anybody know why? Quote Link to comment Share on other sites More sharing options...
SRK Posted March 4, 2009 Share Posted March 4, 2009 The Denso plugs you purchased will be just fine. OE manufacturer, great quality. Quote Link to comment Share on other sites More sharing options...
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