if the oil can warning is on for a few seconds when you start the bike - especially warm, then it isn't a worry. There is a lot of debate over the benefits of this, but Rotax redesigned the oil filter and put a higher flow filter in, which is a bit bigger. It causes this low oil pressure warning for a few seconds when the bike starts, as long as you don't see the warning as you ride, or for more than a few seconds it's nothing to worry about.
Oil consumption wise, try to keep the tube filled in the middle third of the range, too much & it will blow out of the engine, past the rings and out the exhaust etc, too little - well I guess you can figure that out. They use more if you top them right up.