As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EXPERIENCED AT TOTAL ENGINE FAILURE DUE TO LOSS OF OIL PRESSURE. THE CAUSE WAS TO A B-NUT ON A T-FITTING LOCATED ON THE METERED PRESSURE TEST PORT FOR THE THROTTLE BODY HAD WORN A HOLE THRU THE OIL FILTER HOUSING. THE THROTTLE HOUSING IS MOUNTED ON RUBBER TUBING AND MOVES THRU VIBRATION AND MAKING CONTACT. THERE NEEDS TO BE MORE CLEARANCE BETWEEN THE FITTING AND OIL FILTER.