The local dealer stop carrying xd-50,only xd-100, says I can just dump in in tank. My guestion is since I set up for 50 wont it waste it by putting too much into engine. Cost was by one ,second is half price so it was almost same as buying two xd-50. I understand its better and all, but he says nothing needs to be change. By the wayhe is a Yammie dealer but sells all brand of oil. Thankhs very much guys, P.s. Ican drive aways and get xd-50 from my ranger dealer