Best deal: $4.19 per quart (41.7% below the median) — Castrol GTX 5W-30 Synthetic Blend Motor Oil, 5 Quarts
Price range: $4.19 – $58.52 per quart across 45 offers. Median sits at $7.19.
Top brands showing: Castrol Gtx, Castrol Edge, Valvoline Max Life.
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