On Aug 15, 12:11*pm, Karl Townsend
wrote:
The wood deck on my heavy duty 5th wheel trailer hasn't had anything
done to it.

"The Kid" tells me to put a good heavy coat of used motor oil on the
two inch planks and let it weather. Good idea?

Get some stain. It lasts better than 'water treatment', and will cure
so you don't leave an oily runoff when the rains arrive. It's easy
to redo
when the time comes (paint isn't so forgiving).

It'll cure water-resistant, so it'd be nice if you could store
the trailer non-level (to let water run off).