cmshoot Posted January 30, 2007 Share Posted January 30, 2007 I keep reading different plugs as being OE for my 2000 LS400. I have been told NGK Laser Iridium #IFR6T11 and NGK Iridium IX #BKR6EIX-11. Which is it? Or is it another? Over the years, with many different vehicles, I have come back full circle and just tend to use OE plugs in 'em. Thanks, y'all. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted January 30, 2007 Share Posted January 30, 2007 Neither are OEM for an LS , iridium was never used back then. Quote Link to comment Share on other sites More sharing options...
cmshoot Posted January 30, 2007 Author Share Posted January 30, 2007 What was OE for my car? Quote Link to comment Share on other sites More sharing options...
LScott400 Posted January 30, 2007 Share Posted January 30, 2007 What was OE for my car? Looks like a Nippondenso 90919-01210. Quote Link to comment Share on other sites More sharing options...
cmshoot Posted January 30, 2007 Author Share Posted January 30, 2007 Thanks Quote Link to comment Share on other sites More sharing options...
LEX4 Posted January 31, 2007 Share Posted January 31, 2007 DENSO SK20R11 NGK IFR6A11 Page 227 Owners Manual http://www.densoproducts.com/resultsSearch...97&kid=2567 Quote Link to comment Share on other sites More sharing options...
cmshoot Posted February 6, 2007 Author Share Posted February 6, 2007 You're correct. The owner's manual for my 2000 LS400 states iridium plugs. After running a pint of Seafoam in a tank of gas, and a 1/2 pint through the brake booster line, I changed the plugs with NGK Iridium IX's. Man, what a difference! I noticed a difference after the Seafoam treatment, but along with the new plugs, I can't believe how much smoother and more responsive she is. Quote Link to comment Share on other sites More sharing options...
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