my crown vic just had the same problem we saw minus 30 here in talkeetna alaska and i think this loosened the filter.
This motor had used only a half s quart in two years, then i noticed after or during cold nights black snow.
i saw a pool of oil under the drivers side where the filter is. Saw a post similar to this one and checked my filter and it wad loose.
hand tighten it and waiting to see now praying this is it.