They will add Oil if needed. Battery water level- check science batteries in forward console for the correct amount of water. A flashlight and bottle of distilled water will be left in the forward console for this purpose. Engine starting batteries are sealed so no need to check the water. You should check their voltage by turning the Key on and reading the gauges on the console.
Fuel gauge is located in seat console.
You can also look in the fill port between the seat console and the computer console. Log all fuel added and hours in the LOG BOOK which is located in the Seat Console. Never let fuel level get to less than one quarter full. When charging science batteries, all battery switches should be OFF . This is a smart charger and will shut down when fully charged.