I have many, many hours under my belt in a Super DC 3. The wings were different, allowing shorter take off/landing, the tail was more square, and the engines were changed out from R1830's to R1820's. The 1820 had considerably more grunt and was a single row vs. double row. The Navy called them C 117's. We had several in my squadron in Corpus Christi configured as air navigation trainers. They would go forever as long as you flew them every day. OTOH, let one sit for a week, and it might never fly again! Just before I transferred to a jet squadron, the Navy decided it was no longer necessary to change the oil in the R1820. Just keep adding and change the filter every so often. They leaked that bad. During preflight inspection, if there wasn't a puddle of oil under both engines, the aircraft was down until the oil had been checked.
Lost an engine on one over the Gulf one day. It was looking for a few minutes like we might have to ditch it. Then the other engine smoothed out and we made it on in to Pensacola without further incident. After landing, we had to wait on the runway for a tow truck. Hard to taxi a tail dragged on one engine.