I have used Blackstone several times with a, "mailed on Tuesday, results received by Friday" time line.
That being said, i am not sure about doing further oil analysis. To get a basic analysis the cost is around $20. A TBN is another $10 which would indicate to me if i needed to change the oil soon.
So the total for the oil analysis information is around $30. I can buy German Castrol (Go Elves) for around $4 a quart, a filter for around $8. So for $28 plus a bit of my time i can change the oil to fresh elves brew, i mean GC. I realize this doesnt alert me to possible increased wear or anti-freeze contamination.
I check the fluid levels frequently and think i would pick up on a decrease in the coolant level. Changing the oil on a OCI of 3000-5000 should alleviate any oil related wear issues. I realize OCI's of 3000-5000 miles on synthetic oil is probably overkill, but my primary reason for running synthetic is high temp protection (Las Vegas, temps in 100-110 F in summer time).
What are other reasons that a UOA would benefit me, either on a cost basis or caring for my vehicle in a better manner?
darrell
sin city