The following information is derived from the FAA's Service Difficulty Reports and Aviation Maintenance Alerts. During descent into the destination, the pilot could see oil streaking back from top cowl louvers and oil pressure began dropping. Pilot shut down engine and feathered prop. Landed without issue. Maintenance found oil aft of the accessory gearbox, appearing to be from around the turbo area. Further investigation revealed oil bypassing the turbocharger seals. Part total time: Unknown Right engine experienced steady loss of MAP in cruise with corresponding decrease in oil pressure. Engine was shut down and secured, pilot diverted. Inspection revealed right engine turbocharger at fault. Replaced turbocharger, inspected engine and components for additional defects, and verified engine produces rated MAP and does not leak oil.
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