I wouldn't suggest it. Dexcool is a completely different, long lasting coolant exclusive to GM vehicles. Dexcool's anti corrosive properties do not vibe well with, what I believe, is the Ethylene Glycol base that steel seal mixed with in suspension in order to seal your head and other cooling areas.
Granted I don't think it would make a huge deal if you did it, but shorten your maintenence time, flush your engine sooner than you normally would.
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