Answer
Dec 10, 2025 - 05:15 PM
The best oil to run in a 6.0 Powerstroke diesel engine—especially when paired with performance upgrades like the Sinister Diesel Cold Air Intake for 2003-2007 models—is a high-quality, full synthetic 5W-40 or 15W-40 diesel engine oil meeting Ford’s WSS-M2C171-D or API CJ-4 specs. Popular options include Mobil 1 Turbo Diesel Truck 5W-40 and Rotella T6 5W-40. Always consult your owner’s manual for climate-specific viscosity recommendations.
