The SDS for QSUP is not easy to find, but it does say GTL base. Who knows? At any rate you can expect it to be fine oil, lots of positive UOA's on here using various QS syns and the QSUP should be the best they've got (that isn't a Euro anyway).
Thanks to everyone for the advice; I've decided to go with QSUP. Hopefully, PUP will be approved for Ford spec WSS-M2C961-A1 before the second oil change.
