I have a copy of some of Gordon Jennings writings Pe. Good stuff

Ya gotta point captin, Mother Nature (the ground) usually wears my engines out for me I try to baffle well, set the needles correctly, run quality oil from the get go and have fun. Missing any one of those and you could be asking for it.

Altavillan--When I ran Amsoil it was mixed in the 70:1 range and seemed OK besides the hard deposits.