Hello. I have been flushing my front differential that hadn't been serviced in the last 15000 km (9000 miles), and the oil coming out looks horrible. The service interval is about 20000 miles I think, but I replaced it earlier cause I made some water crossings, but I expected it to look better anyway. I could not take the bolt out of the rear differential so I can not compare. This is how it looks: About the new oil, I put in SAE EP (Extreme pressure) 90 GL-5. The FSM says over -18ºC SAE 90 GL-5 is ok, but it doesn't mention if the extreme pressure variant is ok or not.