For the month of June, NAPA auto parts stores are selling Mobil 1 Syn oil for $5.99 a quart plus tax. This even includes the oil for the Sprinters. The reason I know is I just bought 14 cases of the Mobil 1 Esp Formula M 5-40W at my local NAPA store. I've head the radio ad also and they say check with your local NAPA store first to make sure they are participating in this offer. Just thought I would pass this along.