Forgot to re-install the oil cap after a quick change on the Daughter's 2013 Rav last night. She then took it on a four hour trip to Houston this morning and when she arrived someone noticed a drip on the driveway. The cap was replaced and from what I was told it was only a quart low and a bit of mess in the engine bay. I plan to perform another change and clean the bay when she makes it back in town. I'm super upset with myself as I take pride in any work I do. I feel fairly confident that no long term damage was done. Do y'all think any harm was done? Thanks in advance!!