One mechanics opinion about oil

Oil testing for OTR semis and heavy equipment can be a huge money saver. Since the cost of oils changes is high and being aware of problems before they become catastrophic is important. On pickups, it is not so expensive so you can basically change out for what the test costs. However it is still nice to know how your oil holds up so sending it off will tell you if you intervals are correct and if there is anything you need to know about what is going on in your engine. If your running a diesel pickup out of OEM warranty, then sending a sample off once a year wouldn't be a bad idea. CAT here takes oil samples on every piece of Heavy Equipment they trade in (at least here). They want to know what is going on inside the engine before they become owners of it.