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Walmart offers the Mobil 1 10W-40 High Mileage Full Synthetic Motor Oil 5-Quart Jug for $25.47. Opt for in-store pickup to dodge the $5.99 shipping fee. That's the lowest price we could find by $11, although we saw it for $3 less in our mention from last August. It purports to reduce deposits and sludge, condition engine seals, and provide wear protection.