Over the weekend I changed the oil in my truck, and i emptied my breather bottle & there was a little bit of oil in it. Is this normal to have a little bit in there? When I bought the truck it had regular oil in it & I changed it to Rotella Synthetic. And that was back in March of this year. So I put close to 5 - 6k miles on it. Now I'm planning to keep the oil in longer & just change the filter around 4 -5k miles. The truck now has 130k on it... .