I recently was surfing around the Amsoil site and saw they had a company that they recommend to do oil sampling. They would recommend from that sample whether to extend oil changes or keep them at shorter intervals. They also had all kinds of other info that could be derived from a small sample that you send in. I was just curious if anyone has tried having their oil analyzed? Seems like a great way to extend oil change intervals. I would be real interested in having most of my machines tested just to see if everything was running perfectly with them. But I don't want to drop $500 on 8 tests. Anyone have any idea on the cost? Thanks for any info.