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| Message: | Hello, I've got 66k on my 99 M3, I'm changing the plugs to NGK Iridiums soon. Last spark plug change was ~20K miles ago. 1) How often do you change the spark plug boots? Every other time? 2) How long do ignition coils last? Are these a preventative maintenance changeout at ~100K? or do you just wait for them to go bad....... Lastly does anyone have any experience with the Bavarian Auto Ignition coils? The improved gas mileage caught my attention. Not sure it would be worth the cost though... Thanks for the help. mark Buggy '99 M3 Convertible '67 2000 CS | ||||