I did an OCI last week with more ST FS 0w20 but this time with a Fram PH4967 filter.
ST FS and Fram PH filters seem like a good combination for my car.
I was going to send in a sample for a UOA but changed my mind.
I seem to have a healthy car here.
I can always do a UOA later but for now this car seems to be in perfect running condition.
It just seemed like kind of a waste of money for a UOA at this time.
The older I get, the more of a penny pincher I'm getting to be.
That was smart because you aren't likely to get any kind of ROI on doing so. The overwhelming majority do not.
Put the money into the maintenance schedule as printed that and you'll be fine, a leak down is a far better test of engine condition than UOA anyway.
For fun - sure!