The rear axle oil in my FJ was like that, but at 1,600 km. Could be excess heat in the rear axle, a finishing compound left behind on the R&P, poor quality factory oil, many other reasons. My front axle was much cleaner and my TC was clearAny reason why the oil smelled awful? Almost burnt?
When I changed the gear oil again, it was much cleaner. When I checked it again, it had remained clean