BI-MART (member retail chain in Oregon, Washington, and Idaho) is running a sale this month on 5QT Jugs of Pennzoil Platinum Motor Oil for $19.99 out-the-door. They are an approved vendor for the Pennzoil $2/qt rebate which would bring the final price down to $9.99 after rebate per jug.
There is no limit in-store and the Pennzoil rebate is limited to $48 per customer.
Available flavors are 5W-20, 5W-30, 10W-30, and 0W-20
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Pennzoil Online Rebate