Quote:
Originally Posted by Dackelone
IF you park outside in the winter... get the D6. IF you park inside... get the D4. The D4 is a slightly thicker oil/fluid.
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Dex 6 fluids are thinner as a whole than dex 3 fluids were, but really it's just a matter of shear resistance - dex 3 type ATF sheared down to around the dex 6 spec over time.
Id prefer a heavier film for protection, since ATF type mtf is a compromise to begin with.
But I'm not sure practically speaking that at low temps dex 3 (the D4 product) flows substantially different than dex 6 (the D6 product) does.