Originally Posted By: mjoekingz28
Try not to go past a year on your OCI.
Why?
Do you believe that the oil suddenly goes bad on day 366? Do you believe that oil actually knows how old it is?
After running several pieces of equipment (Dmax truck, Kubota tractor, Scag ZTR and classic 1966 Mustang) all out to three year OCIs, I'd have to say the whole "or one year" thing is just a CYA that has no real life application. My UOAs show that oil/filter is still viable way past one year.
Obviously, there are many considerations that go into this decision ... but to blindly put an arbitrary limit on the duration is silly. If you believe that one year is "bad" for oil, then why not 10 months, or 7 months, or six weeks? What makes 12 months the magic limit?
If someone wants to KNOW with absolutely no uncertainty, then they need to get UOAs. But I can assure you, for any piece of equipment that is in good mechanical condition, 12 months is NOT a pragmatic limit to oil life.