On 5/4/2021 2:25 PM, Dan Purgert wrote:
A neighbor has wood steps that are very dark and look almost new.
He said they are not pressure treated and are more than a decade old.

They've been in the ground this whole time and haven't aged a bit.

He pours his old motor oil on them whenever he changes his oil.
I could see where he did in that some wide steps were stained darker.

Does motor oil prevent bacteria and mold and insects from eating the wood?

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I use Chevron Shingle oil every few years to coat the inside of my cedar
gutters. It is a thin non-drying oil that soaks into the wood, but lets
the wood breath, so moisture can get out of it. For wood gutters, any
coating that dries is likely to result in rot.

https://shop.sclubricants.com/chevron-shingle-oil

I would worry about slipping falls using oil for surfaces you walk on,
but have thought about that possibility.