I just changed the fluid and filter today. Make sure you flush teh system out completly until you start to see new fluid coming out. See, I didnt do that! I only flushed a few quarts of new oil through the system, maybe 2, then completed the job. When I put the hose back, put new filter and put new fluid, the fluid immediately turned somewhat dark again and frothy which means that i didnt get all old fluid out. A couple of hours later, the frothy stuff went away and all I have is just slightly darkned fluid. I used the pyroil brand from pep boys which is clear.