92LandYacht, yes I agree.
So, I can show you a flattened cam lobe from my Dodge 360 with hydraulic flat tappets while using Valvoline 10w-40 synthetic oil. It was changed while on the road by a shop due to some non-related repairs, and was driven less than 2000 miles. I had to replace the cam and lifters.
It seems that Valvoline, like most modern oils have reduced ZDDP due to catalytic converters. Mine, being a 1973, has no catalytic converter. I run Mobil1 15W-50 for the high ZDDP content and 50 weight is listed in the manufacturers acceptable list.
This is my specific experience, but I do not want the expense and downtime of replacing the cam and lifters again. I have put over 50,000 miles on another vehicle using this oil, a 1987 V8 with 32 valves, no issues.
I do believe oil analysis is a great way to track your engine health.