Pre treatment for ground contact posts??? got any tips

Like I am sure a lot of people here on HEF have found out since they started making everything 'Green' is it just doesn't last any more....

So does anyone have any suggestions/tips on what to use to give additional protection to ground contact rated posts? I have seen guys soak them in everything from used motor oil to all kinds of mixes of oil waste products... but does it help? any one here done anything similar a ways back and are the posts still going strong?

We put in all kinds of...

Pre treatment for ground contact posts??? got any tips

Pre treatment for ground contact posts??? got any tips