My car consumes some oil. Not a ton... but enough that I'll add maybe half a quart between oil changes to keep the levels right. So today I checked it and it was low. I started adding in very small increments (maybe 15-20% of a quart at a time) and then checking the level. I added most of a quart, and it was still a little low. I had maybe a fifth of a quart left, and considered adding the whole thing, but then decided to take it slow and add half of what was left.
Good move. It is, however, a bit too full now. Not a lot... a bit less than halfway between the full mark and the notch. The engine isn't totally cool, but has been sitting for maybe an hour or so, so it's definitely not very warm still. Is this enough to worry about?