As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT OWNER'S BOOK ON THE O300A CALLS FOR 80/87 FUEL. HOWEVER, THE LEAD HAS BEEN REMOVED FROM 80/87, SO NO LUBRICATION COULD TAKE PLACE. CONTINENTAL USES LEAD IN THE FUEL FOR LUBE. VALVE GUIDES TOTALLY WORE OUT CAUSING LOW COMPRESSION AND HIGH OPERATION TEMPERATURES.