As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)ENGINE WAS RUNNING ROUGH ON TAKEOFF POST FLIGHT INSPECTION FOUND #6 CYLINDER HAD A BAD OIL LEAK AT THE BARREL/HEAD AND WAS STARTING TO SEPARATE .THE VALVE GUIDES AND VALVE SEATS WERE WITHIN LIMITS THIS ENGINE HAS BEEN OPERATING USING AUTOMOTIVE GASOLINE.