Toro 22” AWD Briggs and Stratton, 163cc Personal Pace Recycler

Just Bought last fall. Just. A reference point. Used a few days ago and again today to cut my yard. Noticed it was leaking oil. Not leaking from air filter compartment or carburetor and no oil on ground. Changed the oil per manufacturer specifications; 15oz. SAE 10-W30. Tried to finish the yard. Same problem. When you start the mower without engaging ’Personal Pace’ let it run in this state, (Duct Tape), no oil leaks. Seems to only happen when ’Personal Pace’ is engaged, and you are cutting the lawn.