I used the Penzoil equivalent no issues just like butta. Made a huge difference, already synthetic in the T-Case and diffs. Much improved and less sensitive to quick shifts in low range.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184