Walmart offers a selection of Pennzoil Platinum Full Synthetic Motor Oil 5-Quart Jugs, with prices starting from $22.68. Redeem this $10 online rebate to cut the starting price to $12.68. Opt for in-store pickup to dodge the $5.99 shipping fee. Note: The total maximum rebate possible is $20 per person, household or address (e-mail and physical) during the offer period.