Someone posted on Facebook regarding Centaurus engines and mentioned the original engine oil was made from fish.
Now I took that with a pinch of salt but wanted to ask if there is any truth to the story, maybe not literally but did the oil for the Centaurus contain a quantity of fish oil? Was there something unusual about that particular type of oil?
Whenever I mention the oil for the Napier Sabre that also seems to result in a lot of blank looks.
So can the Centaurus and Sabre be safely flown with modern oils?