That's the thing Dar, you have a big following here. You can say something and others will take it as absolute knowledge. Some one reading the same might assume a seal is a seal and end up with poor results. If in your experience sealed engine bearing don't leak, say so. I said, in my experience, they do leak and the life doesn't exceed the life of the engine, and you and Paul said I'm wrong even though my first hand experience says otherwise, and even the spec for the type of bearing used in the OS engines I mentioned says otherwise. That's my only point. If you want to learn about bearings look up the information. Every manufacturer is different. Obviously, you didn't take the time to look up what I was talking about and continued to interpret sealed as some impervious barrier. I know you have much technical knowledge, but this was something that I had to point out. Dar, I didn't bring up degrees, nor try to belittle you. I just asked you to prove your position with some backup information. If I employed you as an engineer and that was your answer to the question, you can imagine my response.