OK, my 86fj60 turned 120000 miles this week
and I want to change the transmission and transfer case oils. My Toyota Maintenance book (the skinny, 30 page one with the red cover) says to use API GL-5 or -4 with SAE 90 viscosity. I am having trouble finding this exact type of oil. Every place I call (Checkers and Pepboys) says they have multi-grade oils that will work, but I don't know if I trust their advise on this.
What do you all use, and where do you get it?
John