Maximaboy1 Posted August 7, 2004 Share Posted August 7, 2004 When do I repair spark plugs on my 95 SC400? With What kind, platinum or iridium? Quote Link to comment Share on other sites More sharing options...
jzz30 Posted August 8, 2004 Share Posted August 8, 2004 usually i hear at about 100k miles under normal use is a good time to change them but i bet they could go twice that with no problem. and if you arent turbo or supercharged the difference between the performance of platinum and iridium is almost just the price. so dont spend the extra money and jsut get the platinums Quote Link to comment Share on other sites More sharing options...
soarer479 Posted August 8, 2004 Share Posted August 8, 2004 a good way to tell is pull your plugs out and look at them Quote Link to comment Share on other sites More sharing options...
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