John, one is a three cabon glycol while the other is a two carbon glycol. Main reason for the carbon size is to spare the environment. Robert > 1982 Westfalia >> From: "John P. Flaherty" >> Reply-To: "John P. Flaherty" >> To: vanagon@GERRY.VANAGON.COM >> Subject: Re: VW antifreeze ? >> Date: Sun, 23 Dec 2001 19:45:34 -0500 >> >> I've used Sierra for a couple of years without problem. The label absolutely >> does say phosphate free. >> >> Now I'll ask the chemists on the list. Isn't the only purpose of the ethelyne >> glycol to lower the freezing point? If so, what difference could propylene >> glycol make to the engine? I know it's heat transference isn't quite the same >> but I never noticed a difference in my temp guage reading. >> >> Also, didn't I read on the list that the orange stuff tends to gum up after a >> couple of years? >> >> John Flaherty
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