Pump Drive Oil Type?

I am going through the drive system on my 1970s Hydra Mac 8c and read in the manual that the pump drive (accepts drive side of coupled shaft from engine) should have "one pint of no. 10 non-detergent oil". I haven't been able to locate this type of oil, but I spoke with Hackert Sales who specialize in older Hydra Mac machines and they told me everything in the machine gets Dexron 3 except the motor. Can anyone else verify this?

Pump Drive Oil Type?