i am not an expert on york comp. but i think it is a two cylinder jobbie. has pistons rods and a crankshaft pretty much like an engine. so i believe you can add oil to the crankcase. i would take the plug loose carefully and if it starts hissing tighten it up right away.

and go to plan b. ask some one who actually knows.

tom w

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.