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? better suggestions? The
trailer cost $7K and I'd like the deck to last.

Karl

Is it PT wood? Deck preservatives would likely be better than making an
oily mess. Recall creosoted wood factory floors / tinderboxes?