robertn - That's a good point about poison oak. We don't have any around here, but do have poison ivy. I don't burn the poison ivy though, since that would mean I had to put it on the pile, and that would mean I had to pick it up - which I don't do! I spray it with Roundup.
egon - I agree that you have to be careful about fumes. But, I seriously doubt that 1 or 2 gallons of used oil contains enough metal to bother anyone. Plus, that's the first thing to burn and it's been well over an hour before I can get close enough to roast hot dogs, so by then all that's left is the embers from the larger chunks of wood. "wood ashes contain phosphate which is good fertilizer" - The people that used to live at my place had a couple burn piles that I felt were too close to the house, so I cleaned them up some and planted a tree in the middle of each. They are the fastest growing trees I've ever seen! I've always felt it had something to do with the ashes, but didn't know what was in the ashes to make the trees grow so good.
While we're on the subject of fumes, everyone needs to be aware that <font color="red">it's dangerous to burn old railroad ties and other treated lumber. They will emit poisonous fumes!</font color>
Boondox - "When rain is forecast, I cover the whole thing with an old tarp. When the rain is past, I uncover the pile" I've thought about trying that myself, but never did. But, around here the weather forecasters don't have clue when it is and isn't going to rain, so I'd just have to guess at it! Sure sounds like a safe way to burn though.
For those of you who burn in barrels: What do you do with the barrel once it gets full of ashes? The people who used to live at my place burned in barrels. Once it got full, they got another one and set it next to the old one. When they moved, the barrels stayed. There were several of them and I hauled them to the county dump. A couple were rusted out on the bottom, so I had to shovel the stuff into a trailer. There's still glass in that area, I doubt I'll ever get it all cleaned up.