Ok just to follow up on this thread, I have inspected my hubs after it has been serviced and lubed with oil instead of grease.
After the service I have been through Namibia, done Buffalo Gorge as well as the river trip.....about 10,000km.
The result is awesome, auto bub engages every time and looks just like the day I serviced them.
Also here is a video clip I made just to show you how to test if your auto hub is in working order or not, takes less than 1min to test and you dont need to remove the wheels or anything. Simply jack the wheel up you want to test.https://youtu.be/AFdc4z0741E