I have not had mine very long, but I changed the oil when I first got it, and it is now about 3 thousand and the oil is at the same level. The valve cover gaskets leak a little too so that means that the engine is not really burning much at all. Make sure the engine has been sitting or just shut off when you do your measurments every time (keep them the same) as this cummins seems to keep over a quart up above, and can askew results. If yours is high, check for leaks, and make sure it is not the turbo.