socalgs4 Posted August 19, 2003 Share Posted August 19, 2003 hello my friends- because most of you are pretty knowlegeable when it comes to engine maintenance, i would like to ask some questions in that regard. how often should spark plugs get replaced on a 2000 GS400? and is there a more robust after market spark plugs that i should consider? thanks in advance socalgs4 Quote Link to comment Share on other sites More sharing options...
dcfish Posted August 25, 2003 Share Posted August 25, 2003 change the plugs every 60,000 even if they are iridium plugs , and i would advise replacing with nippon denso only there isn't a better plug :D :D :D Quote Link to comment Share on other sites More sharing options...
bbsal Posted August 25, 2003 Share Posted August 25, 2003 at least every 50 to 60,000 miles.platnium bosh isnt that bad either. Quote Link to comment Share on other sites More sharing options...
TRIMENT Posted August 30, 2003 Share Posted August 30, 2003 I specially like the Bosch platinum +4 , but iridium is also good. I've heard that 100k is possible with these, as long as you use a fuel additive to keep plugs carbon free. I use Amsoil PI gas additive PI stands for performance improver, it makes a difference even in extra MPG's. :) Quote Link to comment Share on other sites More sharing options...
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