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Mobil 1 is not a true synthetic by definition - it uses GP 3 petroleum base stocks. The EP version has a LOT more synthetic additives. There are VERY FEW true synthetics left any more due to the skyrocketing cost of PAO base stocks.
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2003 F150XL 4.2 short cab/bed 4x2 5 speed manual 3.55 LS
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