: This is a leading choice for diesel pickup trucks and heavy-duty fleets. It features "Triple Protection Plus" technology to protect against wear and deposits in extreme climates. It is available at AutoZone for $34.99 $25.99.

: This synthetic blend is developed in collaboration with major original equipment manufacturers (OEMs). It is designed to extend engine life and perform reliably in both on and off-highway applications. Blain's Farm & Fleet offers it for $16.99 $14.99.

: As the first brand to create a high-mileage specific oil, Valvoline's MaxLife formula uses premium seal conditioners to rejuvenate aging gaskets. It's a cost-effective synthetic blend option found at Walmart for $19.97. Heavy-Duty Diesel Engine Oils

Full synthetics are engineered for the best protection against extreme heat and cold, often allowing for longer intervals between changes. Mobil 1 Extended Performance Full Synthetic Motor Oil 5w-30 Go to product viewer dialog for this item.

Valvoline High Mileage with MaxLife Technology Motor Oil SAE 10W-30 Go to product viewer dialog for this item.

Mobil Delvac 1300 Super Heavy Duty Premium Synthetic Blend Diesel Engine Oil 15w-40 Go to product viewer dialog for this item.