You should be able to order or source copper chromated arsenate .40 or higher pressure treated wood for ag and industrial purposes. The EPA did away with it for consumer/residential purposes and is why you can't get it "off the shelf" today. Very effective wood preservative, except at some point it was frowned upon for playgrounds, picnic tables etc. I think most would have an opinion to share as to its safe use, myself included.
If this is new material, then you likely have ACQ or whatever the current ground contact treated wood there is available. You should be able to leave it alone if you use the ground contact type. Ideally, install it and let it dry out in place, then use a wood preservative as needed or oil.
The thing is this wood is kiln dried southern yellow pine (at least out here its been this species for as long as I can recall) then it's put into a pressure vessel for preservative treatment. When it comes out it is high moisture. I have hauled more trailer loads of the old stuff than I can recall. Heavy, wet and curls up drastically if left out to dry in hot weather individually.
Like was said, applying oil works, but it must be like kiln dry to wick in properly. I'v done it in addition to creosote, it works well on posts in well drained soils. How you achieve that low moisture content and not have it warp is beyond me. If it does not wick in, you will have a guaranteed slick surface that is dangerous to walk on and or haul things on.
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