SN QS Defy

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Mar 29, 2011
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FL
Just picked up some QS Defy 5w20 at Walmart today and noticed that it's actually rated API SN. When did they change it. Guess I've been out of it for a while. (Still got 10 jugs of Next Gen Maxlife 5w20 from the last Walmart clearance a couple of years ago). Does this mean they lowered the zinc levels?
 
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