I have not done a flush yet.

 

go ahead and do a full flush with it then. itll prob take about 4 gallons to replace it if you drain it good.

 

Well, it is a 2005, so my guess is you'd be okay with a quick flush. Just disconnect the lower hose at the thermostat, and dump water through the overfill tank with the engine running. Do this until it is clear. Re-connect the hose, and put in your mixture.

 

This mod is tempting, too bad im headed to grand forks this winter, aka -40 F regularly.

 

You can do it, too.Just make sure you don't dillute the coolant too much.