Greetings all, I have performed hundreds of UOAs in the past 35 years, and some recent observations I have noted I would like to get the group's reaction to. 1) Comparing VOAs and UOAs using Amsoil Signature series, I have noted that the additive Boron seems to get "Used Up" over the interval of an oil change. Yet other additives seem to stay constant. Why? Anyone have an explanation? Is the amount of the decrease in Boron compared to VOA levels of any use in determining when the oil is exhausted? 2) I have heard others note this observation, and never really believed it until I experienced it myself. A couple years ago, I switched all my vehicles from Mobil 1 AFE or EP, to Amsoil signature series. On BOTH of my Tundras, the vehicles initially consumed oil at the rate of about one quart in 5,000 miles, which neither vehicle ever did before. Yet, after a few oil changes, this consumption stopped, and after even 10K miles, I don't need to add any oil. Anyone have an explanation for this? I can't think of a reason other than coincidence. 3) NONE of my Toyota vehicles have EVER had a significant amount of lead in their UOAs. Is Toyota not using lead in Bearings anymore? I'll probably come up with more questions, but I'd like to toss these out initially. Thoughts?