Clear, oily fluid - hard to really say what that really is. Are you certain it's oil - water condensation will come out of the evaporator drain at the right front - not sure where the leak is compared to where the drain is. Water coming out would be normal; brake fluid (kind of clear) would not! Of course, a brake fluid leak would probably show other symptoms braking as well.
A good physical inspection is in order to see where the leak is originating from.
The puff of smoke - this could be related to some mild piston ring wear. Also hard to say, but I would probably not spend a ton of time on that puff of smoke at this time. I do not think it is related to the leak.