your fan clutch uses gear oil? interesting. rebuild toyota fan clutches is common to get more cooling but its a special silicon fluid like you would find in a viscous coupler, not gear oil. EDIT: I see it had silicon fluid. From what I understand of their operation, it has nothing to do with viscosity as much as it… » 11/21/14 1:57pm Friday 1:57pm

usually its a single drop city, and a single drop highway....maybe 2. either way, its great economy for people who use their trucks as you would a car and not a truck. put a load in there and it will slurp as fast or faster than anything else. » 11/21/14 12:16pm Friday 12:16pm