As far as how its running on 5w-30, it’s smoother still. Put about 900 so miles on if I IIRC. Been driving my f250 a lot as i have been moving my skidsteer around. Could be a fluke that I hit 14k miles as i changed it and that was a magic number that day where the engine broke in.
But I do think its sensitive on viscosity. I can pull it out of my climate controlled garage and later in the day feel a difference as the temps climb up to the high 90s. It started getting hot here in the last couple months.
I have pretty extensive background around heavy machinery and manufacturing. Owner and operator. Watched my dad be able to put his hand on a CNC machine and know when it was ready to be taken out of service or moved into lower precision machining etc. Blah blah blah.
I may be crazy but I think all the fluids in these, besides the diffs, are extra thin for MPG cool-aide drinkers. The tuning is also horrible.