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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