If the line is clear it's possibly a blockage inside the block between the oil pump and external line. It looks like time to pull the pan & oil pump to give things a good cleaning. If the rockers have been running dry it's likely time for a rocker arm rebuild too.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.