Well in a month or so when the temps dip down below -20 its gunna be time to flush the coolant and toss a 195 in there so i have heat, whats a really good coolant mixture and are there any good cooling system flush in a can products that work well but wont cause 50 million leaks?
thanks

Pure Old fashioned WATER!
Everything else will cause the "crud" to disappear & could cause leaks.
Now if you want it CLEAN instead...Well this should do the trick >>>>> GM P/N 12346500 Prestone Heavy Duty Cooling System Cleaner
Only draw back to this is that you'll need a thermostat & Radiator cap too if this is used. NOTE: this stuff will eat EVERYTHING if left in system for longer than 20-30 mins too. We use it at GM to clean out really rusted systems.