I put two gallons of the cheapest antifreeze and water in the tires of my new B7800 shortly after I purchased it. You can get the adapter to fit on your valve stem at the auto parts, at your dealer , or on line. The trick is to put the antifreeze in an old fire extiguisher with a female hose attachment on the end. Put the antifreeze in first and then fill to the valve stem level only with water. What a difference. It literallly only takes fifteen minuter per tire with the fire extinguisher. Good Luck. shortrees