AriestoDiamond Posted September 9, 2003 Share Posted September 9, 2003 What’s up everyone. I'm in the market for some spark plugs. I'm reading that by using the NGK Iridium spark plugs you gain from 5-10 horsepower? The other thing that I’m wondering is are these safe for the car?? The Dealer is charging 13 dollars per plug, that’s 104 dollars (because I have the GS400) plus tax for plugs that are the stock platinum spark plugs. I see the NGK and Denso plugs for about 80 dollars. Anyone with the Iridium Plugs or info please let me know. Thanks Quote Link to comment Share on other sites More sharing options...
bbsal Posted September 11, 2003 Share Posted September 11, 2003 them Iridium Spark Plugs i hear are good but havent tried them yet.they have a smaller electrode then platnium and claim to out perform them because they use Iridium.time will tell!give them a shot!i dont think they can hurt your engine because they acually use less voltage but put out more power!sort of like hid does for head lights! :D Quote Link to comment Share on other sites More sharing options...
martialartsguy Posted September 11, 2003 Share Posted September 11, 2003 well for one thing you already have irdium plugs in your car, gs400 are stocked with that. the gs300 are stock with platium. i know this cuz i changed this my self. and it also states that in the manual... thanks Quote Link to comment Share on other sites More sharing options...
AriestoDiamond Posted September 12, 2003 Author Share Posted September 12, 2003 Thanks for the info martialartsguy. Quote Link to comment Share on other sites More sharing options...
bbsal Posted September 12, 2003 Share Posted September 12, 2003 well for one thing you already have irdium plugs in your car, gs400 are stocked with that. the gs300 are stock with platium. i know this cuz i changed this my self. and it also states that in the manual... thanks good info!i have to pull one on mine and see!i never knew that either! ;) Quote Link to comment Share on other sites More sharing options...
LEXUS420 Posted November 23, 2003 Share Posted November 23, 2003 I bought some for my SC400, but that is gone now with my GS400 replacing her. I asked Lexus here to install them, they said they're stock in the GS4 and last 120k. So now I have an extra set sitting here. Anyone interested, let me know. Quote Link to comment Share on other sites More sharing options...
gserep1 Posted November 24, 2003 Share Posted November 24, 2003 From what I understand, the stock Iridium spark plugs are supposed to be replaced at 90.000 miles, vice 120,000 miles. I have been told that even though it says to "check" the plugs at 90,000 miles, they really should be replaced then. Has anyone gone beyond 90,000 miles on the plugs, and what was the result? GSEREP1 Quote Link to comment Share on other sites More sharing options...
JPI Posted November 24, 2003 Share Posted November 24, 2003 If you have a 98 and below you should replace your plugs at 60k. And 99 and up replace your plugs at 90k. JPI Quote Link to comment Share on other sites More sharing options...
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