I've gotten interested in this topic lately.
I've looked at many UOA, and noticed that some oils will show a higher concentration of copper than others.
There may even be several UOA that show low copper, then a brand change will be made, and copper spikes.
This may explain some of it.
I have assumed it would apply to PCMO as well.
Copper study
I've looked at many UOA, and noticed that some oils will show a higher concentration of copper than others.
There may even be several UOA that show low copper, then a brand change will be made, and copper spikes.
This may explain some of it.
I have assumed it would apply to PCMO as well.
Copper study