Just curious to see who all makes their own fluid and what do you use? I change oil for a few individuals and top off there WWF. Granted a gallon at Walmart is $1.68 but was wondering if it would be just as easy to make my own. I Googled it to find all kinds of ways to make it, question is who does it and how do you like it. Also freezing issues? Here in NC it doesn't get cold for long but we did get down into the single digits this winter. Thanks.