By the time I'm ready to take a smaple of my oil for the UOA, I'll have added 0.75 to 1 qt of oil (GC). This is for about 3700 miles, on a Ford 4.6L sohc(97) (I associate this consumption partly with the previous oil being dino, and the switch to syn, in spite of Arx, came at 93k miles for this car...) I was wondering if this amount of make-up oil can affect the UOA in a way that the UOA is "senseles", and the numbers are really not what they should have been? But then I've seen a lot of UOA's with even more make-up oil added(in comparision the no.of miles on oil), and that noone really has any bad comments about it. Is there a limit amount where you can say "with that much make-up oil, the UOA is wasted!"? I just want to make sure that my UOA numbers still being able to give me useful info about my engine... btw, I'll be getting the Dyson package. Any thoughts/recommendations are greatly appreciated.