We tested these (about 3 years ago, so some changes could have been made) and they will tell you about contaminants but it's pretty wide-spectrum data and that's about all they tested. They did not tell the viscosity or condition of the other additives and multiple tests of the same sample of oil gave different results. The value in oil analysis is not only to extend change intervals but to prevent catastrophic failures and to identify impending failures so that repairs can be made at lower costs and more conveniently. To do this, multiple samples need to be analyzed over time/mileage so that the trend is noted, for instance if you see an increase of bearing metal and then a spike of copper in a follow on sample you know a bearing is about to park your rig. Oil is blended from a base weight oil and additives live viscosity improvers, anti-foaming agents, dispersants and so on, Oil never loses it's ability to lubricate but it gets contaminated and the additives break down. You can have oil that isn't dirty enough to need changing but the viscosity improvers are shot and the oil is at it's base weight, dispersants are gone and contaminants are no longer kept in suspension so the filters can pick them up and so on. I managed two oil labs and I've never seen a device that do a good job of identifying coolant in the oil (we did a crackle test - drop a sample on a metal disc that's on a hot plate and see whether you got the sputter that coolant in oil gives you) though I've been away from the lab side of oil analysis for a couple of years and there could be something out there now (I'm with the Missouri folks - Show Me). Knowing what I do about oil and oil analysis I want to make my decisions with as much info as I can get and the $17 the lab that I use charges is well worth it