Ou trekker,
Did many 3 engine ferry's on the diezel 8, never had a problem, just operate according to the book. Your F/E is most valuable here....
As for some draadtrekker pointing out here; shutting down an engine to save fuel on a DC-8? Uhhm, yeah right. Let's get from FL350 (it only takes you over an hour to get there, not a 70 series...) back to FL260 on 3 engines.....Douglas has a thing called Long Range Cruise...Ever heard of it??