Well guys, I've been a Mobil 1 user since the 1980's. I also use Redline, but mostly M1. My last UOA from blackstone showed a concern for bronze wear on my 6.0L Sierra Denali truck. It has 47,000 miles of which 45,000 have been Mobil 1. I don't see any issues, but the concern of Blackstone was enough for me change the oil today with 4,100 miles on it for another sample. OLM indicated 30% for the curious. This time I used Pennzoil Platinum just as an experiement. I will run it 4,000-5,000 miles and send it in to see if the wear issue goes away.
I'll keep you informed.
I'll keep you informed.