We always seemed to have a "hangar queen" in Aden. It was usually up on jacks in the corner and robbed for spares. Eventually the time would come to fly it back to UK for heavy maintenance so just about enough bits would be put back on again for the ferry flight.
One such ferry flight showed how resilient the Dart engine was. (I think the captain was Ted D). They got as far as Sharjah on the first day. Now not every station had a stock of Dart engine oil so the flight engineers normally took enough tins of the stuff to get them to the other end.
On arrival at Sharjah, the chiefie said that they might not have any oil but he would have a look. The F/E told him to use some of his stock if it proved necessary. Next morning, the F/E's stock of oil was still intact and the F700 showed that all engines had been topped-up so it was assumed that the ground crew had found some after all.
They then got airborne and headed north across the mountains of Iran. On arrival at Tehran, the F/E went up his ladder to check the engine oil levels. When he took the first oil cap off, a black foaming volcano of oil came gushing out. This phenomenon was repeated three more times.
Further investigation revealed that although his stock of engine oil was still intact, his supply of Racasan (toilet fluid) had been considerably depleted! All four engines now contained Racasan.
The Rolls Royce man in Bahrain (Kenny Rogers - I think) and a team were flown to Tehran. All four engines were purged a couple of times and all filters etc were changed. After an engine run it was decided that absolutely no damage had been caused and the ferry flight to UK was completed without further incident.