True. And I greased mine upon assembly.
While I was kidding about HF's chemical smell, I first thought of the 'hazardous waste disposal' hypothesis when new owners of Jinma tractors etc - inexpensive tractors from China - were all asking WTH is this liquid in the hydraulic reservoir, gears, maybe crankcase. Whatever it was, was unrecognizable. Also some Jinmas had casting sand in the crankcase, and I read that Lister clones (small diesels traditionally for ditchpump, or generator) all needed to be disassembled to flush the sand out before filling with proper oil and starting it. I think Hutchman's comment on used motor oil could be what it really was in that case. They have to get rid of it somewhere.