True. Except going over the OEM's OCI....
No... I don't understand where you're getting your info.
As long as you are withing either the OEM
OR Amsoil's recommended OCI you are covered. In the case of DME (What Cummins12V98 and I both run) that is up to 2x the OEM recommendation, or up to 1 year whichever comes first. That is completely free of any UOA. Since Amsoil's OCI is longer than the OEM, and since Amsoil states you can use their recommended OCI for warranty purposes there is no need to do a UOA to run the oil for 1 year.
If you want to exceed 15K miles, 1 year, or 2 resets on the EVIC, whichever comes first, then you have to do a UOA to keep your Amsoil warranty.
I ran my oil this year for almost 14 months, but since I did a UOA at 11 months that said it was suitable for continued use I am covered under the Amsoil warranty in the event of an oil related failure. I could have changed it at 12 month without a UOA and been covered as well.
You should protect yourself because if an injector starts leaking or something happens that causes the oil to be contaminated with fuel, coolant or particulates, nobody will cover you.
True, but that's not an oil related failure nor is it really relevant to OCI's. If you have are getting fuel and/or coolant into your oil and you don't catch it then it doesn't matter when you last changed, or will next change, your oil. A UOA can catch this, but so can regular dipstick checks. I wouldn't expect Amsoil to cover a leaky injector that lead to fuel in the oil, would you?
In fact, if your oil goes over the OEM's OCI, and something happens to your engine, possibly FCA could concoct a series of events where you are liable. Amsoil's warranty only covers oil-related failures. There could be a situation where the failure is created by a series if events and proving the failure was oil-related could be nearly impossible???
If you're going to play the "what-if" game on your warranty then why even drive the truck?
In the end Amsoil should cover an oil-related failure, and FCA should cover any other failure.
Oil related failures are very obvious upon inspection, and also very rare unless neglect is occurring which is also very obvious upon inspection.