What was found
DURING CLIMB-OUT, PILOT NOTED LT ENGINE MANIFOLD PRESSURE INCREASE FOLLOWED BY INCREASE IN OIL PRESSURE. PILOT TURNED BACK AND SECURED LT ENGINE AS A PRECAUTIONARY MEASURE. WHITE SMOKE WAS NOTED COMING FROM LT ENGINE. ACFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED ENGINE FOR CONDITION AND COMPRESSION, DEGREASED ENGINE AND REPLACED DIPSTICK, PERFORMED RUN UP AND RELEASED AIRCRAFT RETURN TO SERVICE.