either way you need 2 gals. m/b coolant which is undiluted. mix 50/50 with distilled water and you have 16 qts enough for the entire job. i have done the flush on 2 cars and use approx 15 qts both times. but i also did a supercooler upgrade and tstat replacement so i was dumping fluid from everywere

easy job a 3 on a scale of 10