Lead is bearing material. What was the number? Get another UOA at the next change. How many miles are you running that oil?
As the miles rack up on an oil change, fuel dilution can thin the oil out causing lower pressures and premature wear.
I ran quite a few UOAs on mine when it was younger. I know from those that a standard oil (such as the 0W20 from the drum that the dealer uses) is toast by 4,500 or so miles in my city heavy and short trip drive cycle. Could I stretch it to 6k or 7,500 with an amsoil filter and boutique oil, sure, but that doubles the cost of the oil change and I have to add to cost of a UOA on to of that. There's no way I'd run any oil that far without a UOA every change. Now that the truck only gets just under 10k miles a year it's just cheaper and easier to get it changed at 4k; no UOA needed every change, cheap, and simple... and I know the motor is being protected.