you don't need a new washer for the drain plug don't even need to soften it just reuse it. I did last change on both our bikes and no leak. I think Amsoil motorcycle oil is best. Slightly better than the stuff your dealer wants you to buy and can be had at Napa.The Amsoil is superior to many oils maybe all but I am probably missing one or 2. Comparisons done by many different sources all seem to agree .

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!