clarkg1124 is correct about the Mopar brand oils. Up until a couple of years ago, Mobil produced the Mopar "packaged" oils for Chrysler but the dealership bulk oil was provided by Shell/Pennzoil. Then, along about 2009, Chrysler signed a new "long-term" contract with Shell/Pennzoil to supply all of their Mopar "packaged" lubricants as well as their bulk oil for their dealerships. It was about the same time that Shell/Pennzoil started sponsoring Penske's Dodges in Nascar. Up until about the 1st of this year (2011), though, you could still get some of the Mobil supplied Mopar oils at dealerships. You could tell the difference between the Shell and Mobil supplied oils because the newer Shell supplied Mopar bottles were shaped differently.