The Mobil 1 0w-40 seems to be in a shortage. Most Oil changers do not have it. Chrysler sent a memo out to all dealers to start using 5W-40 now, to get a better price. Wal- Mart and Auto Zone about the only ones who carry it here in the west, and they never seem to have all 9.5 Qrts. So I have been using 5W-40 and change the Oil and filter every 7000 miles. Running well.