I bought a bottle a couple weeks ago to top off my trans.
It's a no brainer for cars I wouldn't want to spend the money for the MOPAR counter part for, and much better than using generic +3. But, is it better than the MOPAR stuff? Who knows. Someone needs to try runing a trans full of it.
I took notice of the Valvoline ATF +4 two weeks ago at A&A Auto, where I work. A&A has personally phased out all the ATF +3 we carried and the Valvoline bottle says that it is a replacement for ATF +3. Though on Allpar I know there was a little concern over ATF +4 compatibilty with trannys designed for ATF +3 and their seal material.
Should be ok for the first gen 42LE I imagine. I guess several members have been using ATF +4 in their 42LEs for a while.