Is the car still running? Fresh gas and oil in it?
If people saw it in action, working, then i'd guess they'd figure it out mechanically kinda quick. If the car isn't operative, then i'd imagine it'd take much longer.
I have no idea what it takes to make Gas & oil, so i'd imagine that would be the biggest limiting factor. Mechanically, i doubt it would take long to figure out at all.
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Life is like a dick. Sometimes it gets hard for no reason, but it can't stay hard forever.
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