Lard Oil is a pretty good cutting oil, it does have to be kept fresh as it will turn rancid in a rather short time. "Best" thing I ever used for difficult cutting in over 35 years as a machinist has been "Illegal" since about the time I started my apprenticeship in 1964. Several of the "Old Timers" in the shop had supplies of it & when someone encountered a really tough situation they would bring it out. That was "Red Lead", which is not a liquid but more of a soft paste. It was way ahead of Lard Oil. "IF" Hacker Martin had some of it that bit would have gone through the barrel like a warm knife through butter.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra