Macadamia nuts contain a much higher fat content than other nuts. They are naturally ketogenic with a 3:1 ratio of fat to carbs. Depending on how you like your nut butter consistency, it's not neccessary to add oils while nuts are in the food processor. If you like your nut butter more spreadable, add ⅛ to ¼ cup of macadamia nut oil to help smooth it out.