Considering air-to-air re-oiling was not available, this may have been the initial limitation. Flew the TF-41 (Spey essentially) in the A-7....only engine I ever saw with a nucleonic oil quantity gage. In any case, 15 hrs may well have needed some oil servicing at destination.
I don't recall J-79s having that limitation (or an oil quantity gage). Although those look like F4Js.
Last edited by OK465; 19th May 2016 at 20:12.