What would you do as a pilot knowing you have no access to any maintenance manual ? Keep going ? Ground the airplane ?
I would keep going, after they reply to my entry in the techlog.
Nowadays we are used to almost perfection, and get alarmed for the slightest sign of imperfection.
It's not your duty to argue with engineers if they officially
make appropriates entries in the techlog.
If the oil consumption is within limits, then it's within limits.
When I started in Africa flying (also) a DC3, I trusted my experienced sudaf engineer over these grounds...
You fly, and if you have an eng failure, please don't disconnect the autopilot, just trim the rudder!
LEM