hey Clois some guys run a sacrafishal anode in the rad to keep it from corroding anything aluminum,on a side note our motorcycle company KTM suggested changing fluid every year. the blocks are all aluminum ,to keep corrosion to a min iv always done it .I even herd the guys with the old aluminum slant 6s loosing ther engines because of note changing the fluid corroded from the inside out.hhmm i think il change mine now!!!WB3
