Reply To: Full Synthetic or Blend – only +.68c more / gal

Schaeffer still has a few oils with extra zinc for flat tappet cams. I use their 20/50 racing oil in my old Jaguar. You can get it from 30 to 70 straight weight or from 5/50,10/30,15/40, or 20/50. Conventional, semi synthetic, or full synthetic.