I've already noticed a little resistance when I screwed in the allen head drain bolt for the oil filter. I remember reading someone suggesting to remove top two allen head bolts first and rotate filter to prevent oil from draining through the third allen head hole. I did that and then removed the third bolt "drain bolt" to clean oil filter. When I replaced it I could feel resistance which I assume is some metal trash on threads. Can you flush this hole out with carb cleaner or will this contaminate the engine. Does the drain hole lead anywhere? What is the easiest way to consistantly do the oil change and eliminate this from happening?