New better design oil seal? Really? If this low speed shaft seal is leaking at 200 or 700 miles, I can't believe it is the seals fault. With so many getting replaced, has anyone (mechanics) shown closeup pictures of the damaged seals? Is there any wear at a particular location each time? There may be merit to the vent line being the cause. If that is the cause, the seal probably doesn't even need to be replaced. Internal pressure could easily push oil out at the seal surface contact point. And I don't see that damaging the seal. I have pulled the vent tubes on my 70 miles old machine to check for for blockage at the nipples-and had none. I guess the vent hose connecting into the frame was to save another rubber hose meandering through the machine. What I don't know is, where is the other opening in the frame preventing pressure build up. Is there another escape hole, or do I need to drill a hole (large enough) in the frame somewhere? If the frame is part of the vent system, there needs to be a large hole somewhere to allow pressure to escape. There is a lot of surface area in the frame. As it heats up and cools down, it would need a good size nostril to breath.