I am running a 2005 max 200 ox66 that has ran its entire 430 hours on yamalube (ignition hours). The yamalube is kinda hard to get around here and am only able to make it to the marina on Saturdays to get it. Will switching to a pennzoil or amsoil negatively affect the reliability at this point in the motors life? also a gallon of yamalube is 55$ and sure doesn't last long!