Yeah, I've only traded spot oil on an hourly chart or less, usually just minutes, not futures. One bit of bad news somewhere and the price goes outside my risk management level. I'd probably do a lot better trading it long term like you. Same with Gold, can get very reactionary on short time scales.

Oil has to be a long term buy though, don't know how anyone could fail if they can hold it long enough. One day I'll start looking longer ahead than the next day...