I would think the 'oil finish' relates to the final finishing layer, probably a urethane varnish - there would tyopically be a few layers on a floor. Some floors may be waxed after installation, but don't think this is strictly necessary.
Maple floor is very hard wearing and is used on sports arenas (basket ball courts, squash courts etc). Domestically, I think it should be more than up to the job. Provided you buy a well known quality product, it should need minimum maintenance. Waxing over the course of its life may help bring it back to its original sheen.