[Jagdpanzer]

If the engine has been laid up for an extended period I would first drain any oil left in the pan. Then flush a quart or two of clean mineral spirits through the dipstick tube. Blow compressed air through the dipstick tube to clear out any remaining mineral spirits. Then flush again with four quarts of engine oil using the primer rig. Let it set over night so the cam housings thoroughly drain. Install new oil filter and fill to the the dipstick full mark using the primer rig.