The new oil level sight tube on the Atlas transfer cases is a great addition. No more sticking your finger into the fill hole and hoping that you guessed right about the level. When you initially fill the transfer case with the proper amount of oil, a zip-tie around the tube can be used to mark the oil level. Checking the oil after that is as simple as crawling underneath the vehicle and taking a quick look. The top fitting of the sight tube is also one of the easier places to add oil to the transfer case once it’s installed in your vehicle.