Yesterday, I changed my oil for the first time since my rebuild late last year. I couldn't beleive how many aluminum shavings were in the filter. The filter was so clogged that the element was colapsing. I am really glad that I changed the oil. This was only after 5 hours of light to medium use. I think I am going to change the oil again in another 5 hours or less. I am certainly glad I didn't wait until 10 hours like i was thinking! So for all of you that are in a break in period, change the oil sooner rather than later. In hindsight I think I should have changed the oil after 2-3 hours of use.