I'm thinking you had a mental glitch on the oil level part? unless it got in the radiator, there IS an oil line that goes through the block after all, I'm not sure which way things would go though...oil into water or vice versa. Just keep an eye on it and see if it keeps doing it. My truck smoked so bad no one would get near me, 9certainly made it easy to avoid getting rearended,) it had a couple of thoroughly matured oil leaks as well, and I only went through a quart every 150 miles.
