Here is a good discussion on engine oils from the aircraft perspective. Good info for all engine operators.
https://savvyaviation.us5.list-mana...8f8fec1b9da00eedbd&id=6c5904a955&e=81a63f54d7
https://savvyaviation.us5.list-mana...8f8fec1b9da00eedbd&id=6c5904a955&e=81a63f54d7