We're fixin to set a couple fence posts and I was wondering what you all thought about coating the posts before putting them in the ground. The lumber is PT. We set a few (about 50) treated post about 2 years ago and have had 3 or 4 rot out. My neighbor (old timer) said that they use to coat posts with tar before they set them in the ground and would periodically pour some kind of oil, probably used motor oil, at the base of the post to help keep them from rotting. I am not an advocate of putting tar in the ground where I am planting food and am obviously not going to pour motor oil on the ground, just wondering if there was any merit to this.