The MC Yellow supposedly doesn't replace the Gold (Premium Gold G-05)-but, I think it's actually the Prestone with Cor-Guard-so maybe it does! The Ford dealer added Yellow right into my Specialty Orange Transit 250 3.7 without flushing it, so I guess the Yellow must be compatible! Your head could spin just from all the Ford/MC coolants in existence now-old style green, with or without one of TWO different SCAs for diesel engines, Gold (which could also contain SCA), the other FL-22 P-HOAT Green (Mazda), Orange, now Yellow! I don't know how anyone can keep track of all of them.
If you have access to an agricultural environment, for the old school cast iron block/head folks, John Deere makes Cool-Gard II. Online ordering is available as well from many places...cost is in line with other coolants. Coolant