RK55 Tractor Oil-GL4/ISO VG46-Need Help

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Jul 30, 2024
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I have a rural king tractor, 55hp that requires API GL4 with ISO VG46 to 68. I have been looking everywhere but cannot see any oils that indicate both of those numbers. Its for the Hydrostatic transmission and hydraulic oil. Help?
 
Any decent UTHF will suffice. But it needs to be a "modern" lube standard; not some ancient one such as the old "303" stuff. I use RK's Providence (formerly Harvest King) brand UTHF in my Kubota's; been fine for more than 15 years. TSC also has their brand. Any major tractor brand UTHF will also work decently.

The RK tractors are made by TYM; you can find more info on their site.
 
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