Originally Posted by SenorFunkyPants
But it is a trend that is becoming common...a change to 0W40 Mobil 1 is followed by a slight drop in lead and a slight increase in iron.
If the drop in lead is portrayed as a benefit then the increase in iron should draw equal concern. Can't have it both ways.
Until people start running other thinner oils (PUE 5w40, etc), you can't blame it entirely on Mobil 1. I am considering the PUE on my upcoming change.
Some grades of Mobil 1 have shown trace amounts (1ppm) of iron on the VOAs I've looked at.