well its the first oil change since i bought my used 02 250f and i have some kind of dumb questions about doing it. i drained the oil out of the frame, case and went to change the filter but the guy at the parts store gave me the wrong filter, but do you have to change filters every time you change the oil? i thought i remember reading you can clean the filters a few times by backflushing them, is this true? i would return the filter but i lost the reciept for it. how much oil do these bikes hold? i think i read in the service manual 1.70 quarts? so almost 2 quarts? and finally when i went to remove the oil strainer i couldnt get it to come apart, i removed the hose clamp but do you have to loosen the nut above it,? i dont think the service manual is very clear on some things and im paranoid about messing up this engine.