I would say that after 3000 miles it was probably time to change plugs as a PM. Is it safe to say that 3000 miles added up to around 300hrs run time or no? ( you should be able to flip to hrs ran on your dash). If that is the case then you got your use from them. As stated above it may be a good time for a cleaning also!i have a 2009 600 mxz-x etec with aprox. 3000 miles. last ride of the season it kept shutting down and going into limp mode at low rpm's (40x in aprox 120 miles). sled ran good at high speeds, but would shut down in tighter trails. a local trustworthy repair shop told me it was a detoriated plug tip (the metal tip was eaten away). i have not had the chance to test the fix out and i want to make sure there isn't anything i need to do now prior to the season in case there is something else wrong.