O'Reilly Engine Oil sales $1.99/qt (2/23 ---> 3/29/2011)
I have 3 cars to maintain, so I bought 18 qts of Quaker State Standard Oil 10W30 @ $1.99/qt.
In the summer, I use standard engine oil (Winter: I use synthetic).
For those who want Synthetic, then Valvoline SynPower is $4.95/qt.
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