I change mine out about every other oil change. I just use the suzuki diff fluid. For the rear you just need to make sure that its compatible with a wet brake.
Here is a list, thanks to nyrocatv
REAR DIFFERENTIAL FLUIDS
Double check any fluid that you are interested in. Make sure it is WET BRAKE compatible.
I AM PRETTY SURE THAT ALL THE OILS STATED BELOW CAN BE USED FOR THE KING QUADS REAR END as stated on the AMSOIL site.
AMSOIL Synthetic Tractor Hydraulic/Transmission Oil is a direct replacement for any of these oils.
ARCO Tractor Fluid
BP Tractran UTH
Case Hytran
Chevron Torque Fluid
Chevron Tractor Hydraulic Fluid
Conoco Power-Tran III Fluid
Conoco Farm Master
Gulf Universal Tractor Fluid;
John Deere Hy-Gard
Kendall HYKEN 052
Kubota Super UDT
Lubrication Engineers 7500
Lubriplate UTF C-4
New Holland, Ford M2C134-D & FNHA-2C-200.00 &201
Mobilfluid 300, 350, and 424 ( Suzuki Owners Manual recommends a 424)
Pennzoil HYDRA-TRANS
Phillips HG Fluid
Royal Purple SYN-Tractor III
Shell Donax TD
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