It doesn't matter how old your X is you need to check all of your fluids. I was doing a pre-trip inspection and remembered reading that people have found that their front diff fluid is low. I checked and my front diff was 10oz low and my xfer case was 12oz low. This is on a vehicle that only has 2000 miles on it. There is no leaking, just low from the factory. Do yourself a favor and check your levels. The diffs and xfer plugs take a 10mm hex wrench, ratchet ones work best.