In the clock trade they say DONT use 3 in 1 and auto oils
And the worst is Wanton Destruction 40 :-)
they are the oils guilty of the thick sticky residue
when they dry
clockmakers prefer non drying oils for that reason some of the
synthetics are good in that respect
before synthetics clock oils were based on some of the animal oils
It shouldn't be too hard to get watch or clock oil, sold as such. In
London I'd got to H.S. Walsh (now in Biggin Hill, they've moved from
Beckenham). There are many grades, but a couple of them (a light watch
oil, and a somewaht thicker clock oil) would be OK for most jobs.
-tony