having oil in the crankcase do you mean there's an actual spray out the tube, or a visible cloud of smoke, or that you find oil on the ground where it's been parked?
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics