Amazon offers the Pennzoil Platinum 5W-30 Full Synthetic High Mileage Motor Oil 5-Quart Jug 3-Pack for $41.90. Redeem this $30 mail-in rebate to cut the price to $11.90. Plus, Prime members receive free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $9.30.) That's $33 under what you'd pay in-store locally.

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Note that this item is on backorder with an estimated shipping time of one to two months.