Instead of engine oil, I use chain-saw bar lube in my recipe. It's "stickier" than motor oil (it's made to cling to a moving chain) and isn't that expensive.
Sometimes I'll just shoot the bar lube in the cavities.

Ah-- Chainsaw bar oil will be good....

A few years ago, I had some 'steam-cylinder oil' That stuff was like honey in viscosity and incredibly sticky.

Sadly the oil suppliers that had it, closed down--They could supply practically any oil or solvent you can imagine--Amazing place....

Maybe a steam railroad guy would know the stuff and where to get it

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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....

Engine fogging oil might be another alternative. Amazon.com: STA-BIL 22001 Fogging Oil - 12 av. oz.: Automotive