I recall buying Aeroshell (oil for turbine aero engines) in Quart cans (2 pints for the younger people) and it was fairly pricey; made car oil seem damn cheap.
I got the liquid paraffin on-line for not much money. The fact that Ken the Kenwood man (K4EAA) had used it over a long period of time, and described it in fine detail on his website
https://k4eaa.com/dummy.html, made it good enough for me.
B