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Thanks for the diagram, but the 964 is slightly different in that it only has one oil filter. I cannot seem to find a similar diagram in my 964 service manual, at least not in the obvious place, and Adrian's book doesn't seem to have a diagram at the level of detail of your 993 illustration, so I'm guessing a bit...
In the single oil filter 964 system, does the oil flow though the filter on the way to the engine or on the way back from the engine? If it is on the way back, then the object could reach the pump and pressure relief valve straight from the tank.
If the object was from the piston squirter as you have suggested may be possible, wouldn't it have to pass through the screen on the oil pump? What is the hole size in that mesh?
--tnx
--tom
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