Kewsea it is still not fully clear to me that by "half full" you mean halfway between the Max and Min marks, which should be no more than about 15mm apart, or something else.
However there is no need to go to the dealer if the above is what you mean. If the level has gone down by no more than the distance between the marks, it is fine.
Read the manual, it will reveal all, complete I am sure with a picture of the dipstick. And put oil in to bring it to the Max mark, and take note how much you have to put in. It might only be half a litre. Then you can work out your oil consumption.
It's not strictly necessary to top up if it is above the Min mark, but it will do no harm unless you overfill.
On the other hand - if by "half full" you mean halfway from where it started to the bottom of the stick, you might have a problem. Have any lights come on? If the oil gets very low then I would expect the oil pressure light to flicker on bends. If that happens, top up immediately if not sooner.
I don't see a problem with filling to Max. I don't think this engine does dump diesel into the sump, but if it is so designed it will have a X or other mark higher up the dipstick. The level must never be above the X. My Mitsubshi and its predecessor work this way but neither has ever got anywhere near the X.
In future, check the oil every couple of weeks. Running with low oil (below Min) WILL kill your engine. By checking it you would also see whether it goes above the Max too, and can deal with that if it happens. The Mazdas that blew up from excess oil/diesel in the sump were presumably driven by people who never checked the level (which these days is most people).
Incidentally, I wasn't aware that these cars had a reputation for using oil. I ran a CRV i-CTDI (not CDTI) to 95,000 miles and it used very little, so maybe the i-DTEC doesn't necessarily use much either.
Edited by Manatee on 17/07/2017 at 15:10
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