?? on correct ATF fluid for hydraulics jacks

[bestins]

2008 Diplomat SKQ   The manual calls for dexron lll mercon atf fluid. I'm looking for the correct fluid to add, I think I'm a little low, jack lights flash when I go up steep hill.  I can't find dexron lll, I do find a valvoline dexron/mercon atf fluid which I think is what I need. I also read not to use the dexron VI. Any help is appreciated.  

[Ivan K]

Yes, back compatible with Dexron III if you just want to top it of

[bestins]

OK, thanks for the help