I will likely be changing the differential fluid in both of my vehicles in the near future, but I was wondering what the best method is for getting the new oil into the differential. I see that AmsOil has a small pump that fits on their bottles which has a hose that you simply place in the fill hole. Does anyone have any recommendations on a good method to use? I would assume that some type of pump is necessary with the differential fill hole being so close to the bottom of the car. Thanks!