Question on auto antifreeze ?

Vegetable oil works just fine. I've been doing vegetable oil over the seal for years in trailers. Even after sitting for months I've never came back to something that looks like gear oil. The oil does go rancid, but I don't don't plan on cooking with it. After months of sitting you get a bit of a rancid smell if you stick your nose in the bowl, but the odor isn't strong enough to foul up the rest of the trailer.