What was found
(CAN) AFTER TAKEOFF, THE PILOT NOTICED THE OIL PRESSURE DROPPING ON THE RIGHT ENGINE. AS IT APPROACHED THE CAUTION ARC ON THE GAUGE, HE ELECTED TO SHUT DOWN ENGINE AND RETURN TO AIRPORT.HE THEN NOTICED LEFT ENGINE PRESSURE DROPPING AND DECLARED AN EMERGENCY. ENGINE SEIZED AND A WHEELS UP LANDING WAS MADE SHORT OF THE RUNWAY. MAINTENANCE STAFF DETERMINED THE PROBLEM TO BE LOSS OF OIL DUE TO FROZEN ENGINE BREATHERS.