US NTSB reports engine failure led to fire on ferry

The crew had last changed the entire quantity of lube oil for the number two auxiliary engine in September 2022 - about 13 months before the engine failure - but the engine had operated more than 5,000 hours with this lube oil in the engine, five times longer than the manufacturer’s recommendation.

Additionally, since the last change of the lube oil filter elements in May 2023, the engine had run over 3,000 hours. The engine manufacturer’s recommendation is to replace filter elements at every oil change or after the filter elements had been used for 1,000 hours.