[Evans, Marv]

Sammy makes some good comments, but for the cost I'd still like to occasionally (yearly?) get this done to establish baselines and keep on top of things. In the past when I've had oil amylases done, I've gotten the results in the form of raw data without any info on parameters for indicating amounts out of the norm. Actually I already learned something from Mike. My little old Kubota tractor always has sludgy oil when I change it - which is decently often. It's a mid '80s tractor with I don't know how many thousands of hours on it. It runs great with very little smoke. But I'm thinking I should be replacing the oil & filter more often because of lots of soot apparently causing the sludgy condition of the oil. Thanks Mike, I've been thinking about that & wondering if something like fine particulates from blow by or whatever is the cause.