I'm still learning all this oil stuff but are you saying that you need at least two, maybe three, UOAs on a specific oil to confirm if it is really working?
For example, you go from AC Delco 0W-20 to M1 ESP 0W-30 and you get the same iron numbers on the first UOA. But, on your second UOA with ESP, if your iron numbers drop, that's a better indication that the ESP is doing it's job?
Would it be the same the other way around in that you could go from M1 back to the Delco and you iron numbers stay the same. But on your second UOA on the Delco oil, you iron numbers could, in theory, jump back up?
For example, you go from AC Delco 0W-20 to M1 ESP 0W-30 and you get the same iron numbers on the first UOA. But, on your second UOA with ESP, if your iron numbers drop, that's a better indication that the ESP is doing it's job?
Would it be the same the other way around in that you could go from M1 back to the Delco and you iron numbers stay the same. But on your second UOA on the Delco oil, you iron numbers could, in theory, jump back up?
