16+ Treating Wood With Used Motor Oil. I think you're best off using a sealer or stain that is made for the purpose of painting outdoor wood, and taking your used motor oil to the proper disposal site. I have brushed used motor oil on my trailer decks for my entire life without a thought about polluting anything.
If you just treat your wood with linseed oil, you will most likely have to do it at least once year (twice in my climate).
Whether you're dealing with cooking oil spills on floors and benches, or hand oil from repeated use of treat oil stains on wood as soon as they occur to prevent the oil from sinking deep into the wood and causing stains. Places where used motor oil was not handled in a careful, environmentally safe manner back in the day are now considered superfund sites. Stay down wind from the smoke especially beforeyou throw the. Untreated wooden fence posts are susceptible to water damage.