RG1
Platinum Member
Glad you got it sorted. I wouldn't worry too much just yet, but I would definitely keep an eye on things, and maybe change out the fluid one more time soon. It is a lot cheaper than repair bills. Using the diff lock a lot definitely accelerates wear, and that could be the shiny particulates you see in the fluid. How much you use the actual brakes matters too, since they run in the same fluid as everything else. Try to lay off using the diff lock whenever possible unless you really need it. Maybe add weight to the rear wheels and tires instead. I rarely ever needed my diff lock on either of the two 445's I've owned.