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Costco's Heavy Duty Diesel 15w-40 for $11/gallon, 3 pk includes free shipping - Ford Truck Enthusiasts Forums
Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil (2.5-Gallon, Single)(Packaging may vary) : Everything Else
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Ford Motorcraft SAE 15W-40 Diesel Motor Oil The Petroleum Quality Institute of America