Re: Tranny Fluid For Fogging Oil??
I will stick with what works for me.fogging oil in my left hand and a dose of Marvel mystery oil to stall it in my right hand.
You said it best: "Stick with what works for me".
As others have stated, trans fluid would work but it
may not "stick" to surfaces like one would want for engine storage etc.. Maybe it does stick however, and that's why the individual you spoke to swears by it - one never knows.
I too use MMO and fogging oil placed/poured in my boats "fuel filter" to help with the injection system preservation during winterization. I then kill the engine and fog each cylinder twice (with dedicated fogging oil), with rotation between each application. I then change the filter in the spring and stoke her up.
As for the men above, no one here said anything about running MMO in the crankcase nor in the "gas tank".

Sure the MMO instructions say you can but that was not part of the topic.
Everyone I know (that uses MMO) however, swears by it when it comes to preservation and or storing engines/mechanical "stuff". Does this imply that it's the best thing known to man? No, just that numerous individuals find the product helpful for their application. Like CAPTJason, I too use it for pre/post air tool use etc., - and several of my impact guns/wrenches are near 25 years old and still have the torque they did as new. That's actually when/where I was introduced to MMO.

Good stuff for that type of use.
I say stick with what you're doing Crazy Charlie!
Cheers