OK, I have a 912iS but I believe all of us, at initial install, have an empty oil cooler. I just did my first oil fill per the manual. I would refer to the manual on method of filling and purging the oil system. On mine it as simple as disconnecting the oil return line from the tank. Plug the tank and put a 5psi pressure into the drain line after capping the tank. Pull the prop through (60 times for me) and oil pours out the return line into a bucket.