here's the skinny.
on machines that use wet liners, you want to use an antifreeze that has SCA/DCA addatives. IE.. you want cavitation and electrolysis protection. Either can cause pinholes to form in the liners / block. In practice, i even run sca/dca addatives in diesels with dry liners.
You can buy 'fleet precharged' coolant that has these addatives in it.. or you can just buy the plain 'green' stuff at walmart, then buy a bottle of the addatives.
You will want to either get the correct test strips for your addatives, OR mix by volume, based on your machines capacity. IE.. either add the chemical till it is correct strength in your cooling system, or read the directions on volume and concentraion, do shome high school math and know tht you need to add 'x' ounces of addative to 'yy' gallons of coolent to reach 'z' concentration, then check your machine capacity of the cooling system, then solve for X to reach Z
napa sells a coolant add called napa cool # 4056
i believe it is a wix product and napa cool, wix cool, and carquest are all the same add. here is a link to a msds that appears to support that ..
http://www.wixconnect.com/assets/WIXKool MSDS.pdf
I know most ford dealers also sell fw-15 addative.. I believe many NH dealers sell it too. I've no doubt that others do as well.. I am just not familiar witht heir product line.
you can find a DCA 4 addative as DCA65L at many large truck dealers.
International dealers for sure sell sca/dca addatives..
soundguy