Mobil now has two synthetics, Mobil 1 and Mobil Super Synthetic, but if you'll look at the MSDS on both you'll see that they're about the same oil but Mobil is trying to introduce the Super Synthetic so they're offering a low price on it now.

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2003 Ford Ranger XLT Ext. Cab. No Mods
4.0 SOHC (E), Auto.
2WD