I have been using quite a few synthetic oils since purchasing my car new from Amsoil sig series,Royal purple,Redline,and now switched over to Pennzoil ulta platinum,seems like very good quality overall and have not sent a sample to blackstone for any oil analysis but at the current price on Amazon for 38.65 seems more like a winner without having to break the bank like many other full sythetics on the market. Z http://www.amazon.com/gp/product/B00JMCCGDQ?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00 BTW at the current sale price will probably stock up while the promotion is stll going on.