When I had my F-150 in for a oil service at the.

There's air circulating through the engine anyway to draw out blowby fumes. It's more common, especially on smaller engines, for the oil to spray out all over the hood and engine. If that didn't happen, I would mention it at your next oil change, but after 1800 miles I don't think I'd be too concerned. I drove my Grand Caravan with no cap for about ten miles while I was driving down the road, ... Looking for my oil cap that I forgot to put on!