You'll likely need a
socket wrench and the correct size
socket for the oil adapter. The size will depend on the specific adapter on your 1993 Jeep Grand Cherokee. It's usually a fairly standard size, but you should check your owner's manual or consult a repair manual specific to your vehicle to confirm.
Sometimes the adapter can be stubborn, so you might also need a breaker bar for extra leverage, and possibly some penetrating oil (like PB Blaster) to help loosen it if it's really stuck. Always wear appropriate safety glasses when working on your vehicle.
