[Gromit]

Agree with Truckster - no stop leak.. ever.

When I took chemistry 101; the Prof showed us how pure H20 is not conductive! Surprising; since you can imagine if you are sitting in the bathtub and someone suddenly bursts open the bathroom door tosses a plugged in toaster into your tub with you - you might be justifiably worried...

Or if you are standing under a power line in a rainstorm and the 10,000 volt power line suddenly comes down in the puddles at your feet...

But apparently you need only worry about this if there are minerals in the bathtub water.. if it is pure distilled water you would be okay (though I won't be volunteering to test this); hopefully experts on this site will soon weigh in to correct me.

Anyway; I say all this to recommend that you fill your system with distilled water; about 5 gallons should be close - maybe six - you can buy that for about $6 - The galvanic corrosion is the thing to look out for and to try and prevent; in my opinion.

Then change that distilled out maybe once or twice more given what you are seeing..

Personally I don't like the risk of mixing the tranny coolant with the engine block coolant - I keep those two cooling systems separate (which has its own disadvantages, I admit)... So in other words a remote tranny cooler that is separate from the engine block cooler / radiator).

It sounds as if you are going above and beyond already to try and do the right thing; so all I can really offer is my own opinion and props for doing right so far!