How do you top the front diff up with oil on a frontera diesel 2.3 long wheel?

To top up the front differential oil on a Vauxhall Frontera diesel 2.3 long wheelbase, locate the fill plug on the differential housing. Remove the plug using the appropriate tool, then use a fluid pump or a funnel to add the recommended differential oil until it reaches the bottom of the fill hole. Replace the fill plug securely after topping up. Always check the vehicle's manual for the correct type and quantity of oil.