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Hyundai to Be First Automaker to Sell New Cars on Amazon
(www.wsj.com)
This is a most excellent place for technology news and articles.
I didn't use additives - I used Amsoil Signature Synthetic. On my current car I get Pennzoil Platinum / Ultra Platinum. On GDI engines, the oil's breakdown resistance is a big deal. You can tell what oil isn't good by how much faster your car burns thru it.