On Tue, 4 May 2021 21:25:41 -0000 (UTC), 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?

Troll, troll, troll your boat...

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