SAAB's antifreeze in no different than anything else. Its either
Propylene
Glycol (standard stuff) Dexcool, or the enviro stuff. Have a look at the
label and figure out what's in it.
Not quite true. Silicates Borates and Phosphates are common additives.
They all settle out and can block cooling passages. That is one reason
for the for the coolant change. Any coolant containing also has a shelf
like. When was the last time you saw a "sell by" date on a jug of
antifreeze? How long was that cheep antifreeze on the shelf? How long
before it settles or gels? Silicates also bond to the ceramic seal and
increase ware a few hundred percent.
As for protecting aluminum and not protecting brass,please point me to
your references
Propylene Glycol is a food additive. The standard stuff is Ethylene
Glycol.
For a quick check of corrosion resistance of your antifreeze try sticking
the probes of a high impedance volt meter, one in the coolant not
touching anything else and one on the engine block, you might be
surprised at the potential.
Chris
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