i asked the owner about contamination and he swears no. what someone did without his knowlege is always a possibility. re the 100000 mile claim; i've seen alot of older cars run this with the ethyl glycol solutions with no problems. we recommended putting a corrosion inhibiting additive or a flush at that mileage. some customers did and some didn't. lets face it tho ,most cars at some time before 100000 will have some type of service on the coolant. be it a water pump ,thermostat, heater core, ect. most competent shops will check the coolant at this time.
as far as mixing the two coolants; gm told us that this would cause an acid formation . i suppose this "mud " could be a result of this. i wondered about hard [unsoftened] water being added at some time.
peronally i wonder if the dexcool isn't just a marketing device for $14.00 a gallon coolant. mike
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so many pontiacs, so little time..................
moderator is a glorified word for an unappreciated prick..................
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the
former." --Albert Einstein
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