Diesel - 10ppm vs 50ppm

[RoelfleRoux]

A forum member ran one tank of 500ppm in his Isuzu KB and the oil went pitch black.

Correct. I'm the bloke that reported the oil turning black after one tank. Since then I've avoided 500ppm.
We didn't keep the Isuzu very long and my current car has only ever had 50 or 10ppm. I do not see, hear, feel or smell any difference between 10ppm and 50ppm.

[Stephan van Tonder]

Correct. I'm the bloke that reported the oil turning black after one tank. Since then I've avoided 500ppm.
We didn't keep the Isuzu very long and my current car has only ever had 50 or 10ppm. I do not see, hear, feel or smell any difference between 10ppm and 50ppm.

I'm also too stupid , too insensitive , too lazy to actually track consumption that detailed or the cars I drive don't really seem to care if I have 10 or 50 ppm in the tank but I cannot feel a difference or don't notice a difference on the distance I do on a tank.
The only thing I notice is that they smell different(50 smells more acrid) and there seems to be more smoke on 50. For consumption and power. meh. much of a muchness.
Use 10 when I can which keeps the oil cleaner.