I'm creating a sort of scissor jack lift that will be mounted to the top of my truck. There will be 3 motors that will raise a platform up and down. The platform will be laying on top of the motors so it'll be somewhat shielded by the elements.
My question is how do I try to weatherproof the motors from humidity, snow, etc. Will using a BLDC be a better choice than brushed? I think I've read somewhere that soaking the shaft in some kind of oil works. Thanks!
Clearly you either buy a (geared) motor that is specifically designed to be weatherproof, or you do not.
Long ago, we used an aircraft flap motor (ex-WWII disposals) to rotate an antenna on the car roof rack. I imagine that was designed to be reasonably weatherproof. 
Do you know where you would source that kind of motor? I've looked at cytron, servocity, and adafruit but I can't find anything. Thanks!
Not sure how you linkage will work but you might look into an automotive wiper or window lift motors. Both are in a location that will get wet periodically.
The one I referenced was part of the flood of "disposals" items that followed World War II. That sort of thing does not tend to happen these days. 
What was good about it was the heavy gearing. A windscreen wiper motor would not provide (anywhere near) as much torque and it sounds like you need substantial gearing for a scissor lift. A window motor just might if the load is not heavy.
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