Best deal: $18.37 per gallon (28.2% below the median) — Castrol GTX 10W-40 Conventional Motor Oil, 5 Quarts
Price range: $18.37 – $245.64 per gallon across 39 offers. Median sits at $25.58.
Top brands showing: Castrol Gtx, Castrol Edge, Mobil High.
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