Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
The northstar engine you have is very common to leak oil between the case halves of the block. this would be very hard to see from the top, would need to look from under side with vehicle on a hoist.
That is water from the evaporator drain tube, this is normal when the air conditioning is on, it may be possible that the hose was dripping onto the exhaust pipe causing the water to steam/smoke. You could try to route the hose in a different direction and see if that helps.
The drain hose should be between the engine and firewall on the passengers side.
is there anything else I can help you with?