So a couple of years ago I bought 3 gallons of Zerex G05 & 3 gallons of distilled water ......mixed it all up and poured it all back into the 6 one gallon jugs. Also bought 2 one liter cans of Pentosin DOT4 brake fluid.
Took my 07 (Fred) in to a shop & had the coolant & brake fluid flushed/replaced. So today I took the remaining 3 gallons of 50/50 G05 & the other liter of DOT4 in to have the same done to my 08 (Wilma).

Owner's manual says 11.8 quarts coolant & 1/2 liter brake fluid. Last time no product was returned......assumed to completely replace the coolant they would need the entire 3 gallons of 50/50 mix + to totally flush the brake fluid they would need more than the 1/2 liter DOT4.

This time (same shop) when I got home I found they had returned to me a full gallon of my 50/50 coolant + about a half liter of the DOT4 brake fluid? I guess no way they completely replaced the full 11.8 quarts of coolant.......my fear is they diluted my 50/50 mix.......guess I'll wait till it cools down & check the freeze point/boiling point.......