can anyone help clear up some oil change issues i'm having with my 88 honda 300 4x4, i'm not sure if there is just an oil filter or if there is an oilfilter and oil screen. the haynes manual kinda sounds like it has both, but no mention of it in the honda owner's manual. Also do i have to replace the washer on the drain plug and where can i find rubber seals/gaskets for the filler plug and filter without buying an entire seal kit, thanks