i used impact to get it tight enough to stop spinning then i used a torque multiplier and put in a third of spec. It's worked every time. Once you get to a bit over a hundred twenty ft·lb you shouldn't have the fitting spin.

You can use a hammer on a wrench if you don't have an impact gun.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)