Engine Overhaul

C-85 -12P with about 3,100 SMOH, 1300 since complete bottom overhaul.  All cylinders were O/H as various times during the '90's.  Uses about a quart of oil every 3-4 hours. All comps at last annual in mid to high 70's.  Cost of a field or shop O/H.  I know it 'depends".