I changed my front and rear diff oil at 10 hours. I noticed in the front the oil had some light color streaks in it. I changed it at 10 hrs with new Amsoil 10W-40 and I checked it again when I returned after some fun this weekend, and I am now at 15 hours. Again, the oil color itself has darkened, and there seems to be some lighter streaks from what I can see through the fill hole. What do you guys think, I doubt that it sounds normal. I appreciate suggestions, Thanks fellas

 

its normal, the light streaks your seeing is the metal from the differential wearing in. it will be more noticible if your using your locker.