Amazon offers Prime members a selection of Mobil 1 Synthetic Motor Oil 1-Quart 6-Packs for $27.99 with free shipping, as listed below. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs around $10.) The packs:

• Mobil 1 94001 5W-30 1-Quart Synthetic Motor Oil 6-Pack for $27.99 (pictured, low by $20)
• Mobil 1 96995 0W-20 1-Quart Synthetic Motor Oil 6-Pack for $27.99 (low by $20)
• Mobil 1 44975 5W-20 1-Quart Synthetic Motor Oil 6-Pack for $27.99 (low by $20)