Does any know why Pentosin makes such a big deal about not mixing 7.1 with "modern" hydraulic fluids. The web is full of recommendations about not mixing this fluid. Pentosin claims that it is not miscible with other hydraulic fluids. It seems that myths have grown-up around the confusion resulting in many recommendation of NOT mixing CHS 11s with other PSFs and ATFs. I can't find a reason to think that problems will arise from mixing except that the manufacturer says not to do it. Can anyone help me understand the reality of the situation?
Pentosin says no to 7.1 mixing:
http://www.pentosin.net/pressreleases/CRP-116_Pentosin_CHF7-1_V2.pdf
Porsche says 11s is OK to mix (you may have to copy and paste this one):
http://www.google.com/url?sa=t&rct=j&q=4800_1996_640696geolab.pdf&source=web&cd=2&sqi=2&ved=0CCIQFjAB&url=http%3A%2F%2Fwww.pcarworkshop.com%2Fimages%2F3%2F30%2F4800_1996_640696geolab.pdf&ei=drvJTp_bJuOc2AW4_uDhDw&usg=AFQjCNHfMmAyLhWRzpP0APz5Qcf6wzgZTA&cad=rja
Pentosin says no to 7.1 mixing:
http://www.pentosin.net/pressreleases/CRP-116_Pentosin_CHF7-1_V2.pdf
Porsche says 11s is OK to mix (you may have to copy and paste this one):
http://www.google.com/url?sa=t&rct=j&q=4800_1996_640696geolab.pdf&source=web&cd=2&sqi=2&ved=0CCIQFjAB&url=http%3A%2F%2Fwww.pcarworkshop.com%2Fimages%2F3%2F30%2F4800_1996_640696geolab.pdf&ei=drvJTp_bJuOc2AW4_uDhDw&usg=AFQjCNHfMmAyLhWRzpP0APz5Qcf6wzgZTA&cad=rja