What's difference between DEXRON II and DEX III/MERCON ATF's ? I'm assuming they can be mixed and either can be used in my 1991-740 auto.What did VOLVO put in cars from factory? Isn't DEX 2 or 3 an American product?ALSO- if synthetic ATF runs significantly lower temps(20 C lower) I was told ages ago that trans fluid is designed to operate within a designated range-HENCE the HAYDEN FLEX FAN that use to be so popular for towing/cooling needs-overcooled fluid and apparently there was problems with cooler fluid temps.The first question is the important one-I want to flush tommorrow A.M.-thanks mark
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