Ive got the international 9l 550ci diesel. Its non sleeved. My question is what type of antifreeze do i need and any idea of how much? I pulled the rear heater and the antifreeze was brown..but it looked to be regular stuff. Ive looked and looked and have found some answers but nothing really pertaining to this. Any help is greatly appreciated. Oh also, radiator needs to be flushed. Any special thing this diesel needs to do this?