Here is my recent analysis on the wife's '02 WRX wagon, Redline Oil 10w40 with 6,800 miles and ZERO make up oil added. Pretty easy driving, mostly city. The older analysis listed is of Royal Purple 10w30, but there was a crack in the air box which caused the high iron. I will be sticking with the Redline oil.
Pretty happy with the results.
Quelle: http://forums.nasioc.com/forums/showthread.php?t=1501907