Im not fan of brands and companys, thats why I bougt this seals, not from origin, because 80 euro for a piece of rubber is insane....but this time I have to accept the seal is not a hi quality, even not a low quality, but anyway, I just want to transmit my experience whit this whit the other people, because It is a important point on this truck and I fit the seals whit oil and checking if the spring is on it, the seal was working until the hub reach some temperature, I try the truck on the highway arround 100 km and it starts to leack oil, The two rear wheels have the same problem, and I allrready replace the front wheels last years whit no problems, looking whit more detail looks like the Rubber is more soft on the corteco seals , so I dont really know , but I will fit the origin seals from Mercedes