I know almost everyone in here has read a book or two on oil and the magic it is supposed to bring into your engine. BUT has anyone actually seen a significant increase or any increase in power from changing out the oil. A dyno would be nice. I have read that the polymers can be washed from the cylinder walls allowing the rings to seat properly and all kinds of other things. I agree that there is a difference in oil and the quality that some have over others but actual power, I just don't really know. I think that more often than not people feel it because they think they are supposed to. Does anyone have any real data?