Full Synthetic or Synthetic Blend

It is all Dino oil now. Back when we still could get real Synthetic I decided to try a blend. The engine had a turbo on it. The bearings get hot. The Dino part oil of the Blend would burn or caramalize or whatever into abrasives within the higher performance Synthetic. It looked like brown sugar and felt like sand around the turbo shaft when it was replaced.
I haven't tried a blend again.
When I find a source for the real Synthetics again I'm going to try them. Someone replied with a source while back. I'll have to find it again.