Amazon offers Prime members select Mobil 1 10W-30 5-Qt. Synthetic Motor Oil , model no. 112796, for $22.66 each with free shipping. (Non-members can get free shipping with orders of $35 or more; otherwise, shipping adds $10.60.) That's $15 under the lowest total price we could find for this item picked up in-store. It meets ILSAC GF-5 performance standards.

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