blue devils not cheap, its like 60 a bottle. i got mine at advance auto on line, used a discount code and got a nice break on the price. you'll need some new antifreeze when your done with the blue devil, you need to flush it to water t stat out, then idle it for a hour with blue devil in the water, t stat out still. then dump the rad, refill with 1 gallon of straight antifreeze. not the 50/50 pre mixed stuff.

20 minutes in my exhaust smelt better.