As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOWING LT AND RT PROP REMOVAL FOR SLUGGISH OPERATION, FOUND EXTREME ENGINE OIL SLUDGE. THIS CONDITION OCCURRED AT 768 HRS TCM ZERO TIME ENGINES. FURTHER EXAMINATION FOUND EXCESS WEAR AND SLUDGE THROUGHOUT ENGINE. ACFT HAD BEEN OPERATED USING AV-1 OIL.