Oil Filter Change

I change mine 3-4 times a year...but it's dusty,dirty, and hot for 6 months at a stretch and those factors all add up to reduced oil life. Cheap (well, not really @ $8/qt LOL) insurance. Up where you are, I'd probably do twice a year...it all depends on your conditions and usage IMO. Another thing to think about is how well it stays tuned--running rich even just during warmup driving puts extra fuel in the oil--which also reduces oil life.