AN SMA TWIN SHUT DOWN AN ENG DUE TO OIL LOSS. IT LANDED SAFETY ENRTE.

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DURING AN IFR FLT FROM ALLIANCE; NE; TO ROCKFORD; IL; I EXPERIENCED LOSS OF OIL PRESSURE ON THE L ENG OF AN SMA. I IMMEDIATELY REQUESTED VECTORS TO THE NEAREST ARPT WHICH WAS SAC CITY (SKI). DURING THE DSCNT TO LNDG; THE OIL PRESSURE DROPPED TO RED LINE ON THE L ENG SO I SHUT IT DOWN AND FEATHERED THE PROP. I EXPERIENCED NO OTHER DIFFICULTIES DURING THE FLT. THE NEXT DAY (I WAITED FOR DAYLIGHT TO INSPECT THE CAUSE); THE MECH AND I DISCOVERED THAT THE THROTTLE CABLE WAS RESTING AGAINST THE OIL FILTER. IT APPEARED THAT; OVER TIME; ENG VIBRATION HAD CAUSED THE THROTTLE CABLE TO RUB A HOLE IN THE OIL FILTER CAUSING THE LOSS OF PRESSURE WHEN IT FINALLY BROKE THROUGH. THE MECH REPLACED THE FILTER AND SECURED THE THROTTLE SO IT WOULDN'T OCCUR AGAIN. THIS PROB COULD NOT BE SEEN DURING A PREFLT BECAUSE IT REQUIRES REMOVING THE COWLING TO SEE THE FILTER AND THROTTLE CABLE. I BELIEVE THIS PROB WOULD NEVER HAVE OCCURRED IF THE MECH THAT PERFORMED THE PREVIOUS 100 HR INSPECTION HAD PROPERLY SECURED THE THROTTLE CABLE INSTEAD OF ALLOWING IT TO REST ON THE OIL FILTER.