It wont be the first time I have reard of an engine blowing up, and then finding out that the engine was run without oil, the owner knot being told.
One instance the engine bung had not been fitted, new oil added, taken for a test drive. The survo then tried to cover up the mistake and blame unknower causes.
I heard a story only recently of a rather large mining dump truck this was done to, when it shut down on the shutdown system it was then over riden to start, $500,000 later fixed.