I did not say, at any point, “use non detergent oil” I am saying, I thought very clearly but I’m perhaps getting decrepit, use what they recommend in the manual.

I think I said that? I’ll reread my post.

Yeah I did: “the right oils are listed in the manual on this site”

I think the bit you’ve grabbed hold of is where I said that non surfactant oils were and are used and that they can make the situation a lot worse when you pick up an older machine with unknown maintenance history.

I also considered relating some personal stories about old tractors and machinery on our farm to illustrate my point but I thought that’d bore people and in my field, personal experiences aren’t reliable data.