http://www.pistonheads.com/gassing/t...&mid=0&nmt=911
This is what happened.
For those of you not familiar with the 911, it is an air coooled engine that is dry sumped and has a catch tank in the offside rear wing. To properly check the engine oil level you have to have the car fully warmed up until the oil thermostat opens allowing the system to fully circulate and then dip the tank with the engine idling. If you check it with the engine switched off and cool, you will get no reading on the stick. You may be starting to get the picture.
Before carrying out an emissions check the tester is obliged to check the oil level. Guess who thought the engine was empty?