Recent content by adam_reith

Yes, agree. I'm an engineer but not a "real" tribologist. ZDDP additives and such are a fairly big concern on "muscle cars" that nearly always had OHV, flat tappet cams, and high valve spring pressures. Including late 1980s Buick turbo V6 cars (GNX, Grand National, etc) where there are many...

I had previously saved two copies of Valvoline Restore & Protect 0W20 data sheet, one dated 8/19/2025 and the other 10/1/2024. 2024: Zinc (Zn) 850 ppm, Phosphorous (P) 770 ppm. 2025: Zn 720 , P 650. Significant reductions in Zn and P. Zn & P are...