I think those are all possibilities. But who knows. Yeah, I am leaning toward homemade though, and I'm pretty sure it was used on a farm in cold weather, so I guess it could have been any of those three theories. Any others? What would be cool is if the previous owner happened to subscribe to this website and could tell me himself! 
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1998 F-150 XL 4.6L, 5spd, 4x4, reg cab, long bed, 3.55 LS, K&N Filter
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