From the PQIA...
AP Lubes Supertech 10W-30 is a bit on the thin side, just the way a few regulars here like it. Also rich in iron, copper, and silicon "additives"
http://www.pqiadata.org/APLubesSupertech10W30.html
Mag 5 Star 10W-40 looks like it's going with the potassium "additive" strategy.
http://www.pqiadata.org/MAG5Star1040.html
AP Lubes Supertech 10W-30 is a bit on the thin side, just the way a few regulars here like it. Also rich in iron, copper, and silicon "additives"
http://www.pqiadata.org/APLubesSupertech10W30.html
Mag 5 Star 10W-40 looks like it's going with the potassium "additive" strategy.
http://www.pqiadata.org/MAG5Star1040.html