I don't recall mentioning any companies for a UOA. I pay a little under $10 plus postage for a UOA which includes TBN. Money very well spent IMO. Then I know for certain how my air filter and air filter related plumbing is working, if my fuel injectors have issues, if a head gasket is starting to fail, and if my OCI needs to be tweaked, etc. Win win for me, I feel that I'm spending a nickle to save a dime, or more.Ahhj back to the Blackstone UOA! Why would you pay for this? Their cheapest analysis is $30. Just change the oil. Never understood why anyone takes the times to produce a sample and send it off for analysis. For the less than the cost of the analysis I can change the oil and filter .
Some you would rather spend a dime to save a nickel.