Valve cover gasket and filler cap replaced last weekend. I wiped off the oil under the gasket to check for any leaks and so far, it is dry. What drain hole are you referring to, the one on the right side of the crankcase? I don't have a manual yet and am new to the M103. I was afraid to take off the filter today because I didn't have a spare, but will do it tomorrow. I guess I will be able to see alot more with it off. Thanks!