Originally Posted by dparm
you can't blame it entirely on Mobil 1.
Hmmm I would have thought you can if nothing else is changed (1ppm trace Fe notwithstanding).
There definitely seems to be a pattern of a rise in Fe with a change to M1.
Not that I'm bothered as I'm sticking with OEM Castrol but if I was considering a switch it would make me nervous. At least the lead bearings can be considered a "sacrificial" part where the Fe is unlikely to be coming from anywhere benign.