Hello everyone. I have also been concerned about oil loss on my Kinderay VII for some time. That's why I changed the oil every 1000km to make sure there was always enough oil. Unfortunately a defect has now occurred. The hub has blocked and now you can no longer shift gears. I wrote to Kinderay and i am now waiting for a reply. I only drove about 8000km with my hub. I have now converted back to normal derailleur gears. Unfortunately, I can't recommend this hub to anyone at the moment