My car has a service plan, so it’s done by Peugeot main dealers, but I have to top my oil quite regularly.
I did once get the oil level incorrect message @ a year or so after buying the car. Despite the regular servicing, when I checked, the dipstick was dry.
I have never had a car use as much oil as the Z, and had been complacent, relying on the annual service to be enough. The dry dipstick came as a shock. I topped it up to the max level, and then monitored the levels in case this was the sign of some issue.
I have no oil in the coolant, there is no oil on the underneath of the engine, or where it parks, it just uses oil. I have learned over the years of ownership to check my level at least once a month, and be prepared to top up on most checks.
Definitely go to the top mark, the engine then has some leeway, if it is an oil user, before the level gets dangerously low.