I wonder if I wasn't seeing the same thing with my PUP. Doesn't seem to be a popular oil around here, and in my experience, my engine didn't seem to like it too much. Is it the lower flash point and lower viscosity?Thanks for this chart. This is probably one of the more handy things I’ve seen here.
It also explains why PUP and PP start to burn off in my engines around the 3,000 mile mark.