I did the oil analysis bit for the first few oil changes after I put in the new Yanmar in my boat. I my opinion it is not really all that helpful. Report gives detailed information on all kinds of elements. All were in "normal" range except for a couple of values - so then I can worry about that! Re-rested at next oil change and high values went down ...... so I gave up and just change the oil every 100 hours no matter what ..........runs perfectly ...no smoke and no leaks..........I got enough to worry about and didn't need to know that chromium or silicon levels were a few parts per million higher that the time before so I gave up doing it. My two cents worth .....Charley