nelstomlinson
Full Access Member
It might be worth boiling a bit of Lucas down(like, on the stove) and see what happens. See what it does when exposed to way-too-high temps.
Also, worth trying for regular engine oil.
I remember in a diesel engine class years ago, the instructor took a little steel pot, poured some Delo 400 into it, and heated it with a torch until it smoked. It wouldn't pour out of the can. We called it Jello 400.
If that engine overheated badly, it might have cooked the oil even if it wasn't Lucas.