M mechtech2 Joined Sep 5, 2006 Messages 19,478 Location Chicago Area Feb 3, 2013 #21 Or, add just one qt of the 15-40 to your oil changes.
C crinkles Joined May 28, 2007 Messages 5,579 Location earth Feb 3, 2013 #22 I already do (if you take the US recommendations to heart).