i recently checked the rear diff fluid on my brute 650 sra and it looked terrible. i was expecting to see an oil with a bronzed color but instead it was gray as duct tape. it wasnt thicker than it should be but the spyglass on the side of the swingarm isnt there. on my dads prairie 650 his spyglass is there but on mine you can reach in with your finger and feel the driveshaft. is this normal or should the oil not look that way?