I have been reading some about the "extended life coolants " that are being produced. Seems some of the lines are installing it as OE on commercial mowers; Exmark for one. My question becomes; Could these type of coolants be used in my Cub Cadet 26 HP diesel and Kubota 18.5HP diesel engines? I am unsure as to whether the "extended life coolants" are only for certain type radiators and engines? Will appreciate any guidance.