I noticed today that the oil on my bike is a tad low. About 1/2" below the hash lines. It only has 25 hours on it since the last change but, they’re all plowing hours. I also noticed that there was a bit of oil in the base of the air filter box. Not a lot, but enough that it took some effort to clean it out.

So…

Top it off (and if so, what type and weight)?

OR

Change it (and if so, what type and weight)?