| Amsoil and other vendors offer this service, and is the best way to really keep an eye on things. I do a ton of Failure Analysis where I work (Caterpillar Engines) and I consistently sift through oil samples. Normally the company that does it for you will offer their comments but if you start sampling on a regular interval (oil changes) you can establish a good baseline for your wear metals. If you start to see a rise in copper then its time to start inspecting the bearings. In some cases I've seen it where the tin starts to spike too (the bearing has worn all the way through the copper and into the tin underlayment) Another good thing to look for is silicon with is the ingestion of dirt/debris. This will tell you if foreign stuff has gotten into your oil or have a good boost leak (remember an engine in vacuum likes to suck in stuff) I could go on and on about chromium, iron, lead, potassium, TBN's, etc etc but I'll save you the read - haha
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