Cheapest I’ve found is old KFC oil. Gotta filter it some though. 
I agree it is hard to pin down OEM requirements compared to aftermarket oils. The most annoying part is I’m 99% sure no equipment company actually makes the super duper oem only fluid they sell themselves.

I agree it is hard to pin down OEM requirements compared to aftermarket oils. The most annoying part is I’m 99% sure no equipment company actually makes the super duper oem only fluid they sell themselves.