Whats the best oil to run in a 6.7 powerstroke?
The best oil for a 6.7 Power Stroke is a 5W-40 full-synthetic diesel oil that meets API CK-4 (or FA-4) and Ford’s specification. The OEM choice is Motorcraft 5W-40 Diesel Engine Oil, but several reputable brands provide equivalent formulations that are widely compatible with this engine.
To understand why this matters, the 6.7L Power Stroke is a modern, turbocharged diesel with a diesel particulate filter (DPF) and advanced emissions controls. It requires a high-quality, low-SAPS, full-synthetic oil that maintains viscosity across operating temperatures while protecting the exhaust aftertreatment system. Oil that doesn’t meet CK-4/FA-4 can lead to faster wear, reduced fuel efficiency, or aftertreatment issues over time.
Understanding the right grade and specs
For proper performance and protection, choose a 5W-40 full-synthetic diesel oil that is explicitly labeled API CK-4 or FA-4 and carries Ford’s specification where listed (often WSS-M2C171-F1 or an equivalent Ford approval). These standards ensure compatibility with the engine, turbocharger, and DPF, and they support robust protection under towing, hot climates, or frequent short trips. Always verify the exact specification on the product label or the manufacturer's data sheet before purchasing.
Recommended oil options
The following oils are widely available and designed to meet API CK-4 or FA-4 and Ford’s specification for the 6.7 Power Stroke. Always confirm the precise Ford spec on the product page or label.
- Motorcraft 5W-40 Diesel Engine Oil — OEM-approved option that meets Ford specifications and CK-4/FA-4 where applicable.
- Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil — widely used in heavy-duty diesels; CK-4 compliant.
- Valvoline Premium Blue Extreme 5W-40 Diesel Engine Oil — designed for modern HD diesel engines; CK-4 compliant.
- Mobil 1 ESP Formula 5W-40 Diesel Engine Oil — premium synthetic option marketed for diesel applications; CK-4/FA-4 compliant.
Note: Availability and exact approvals can vary by market. When in doubt, consult your owner’s manual or a Ford dealer to confirm the required specification for your model year and region.
In practice, many drivers run any reputable 5W-40 synthetic diesel oil that explicitly lists CK-4 or FA-4 approval and Ford’s OEM specification. The key is to avoid oils that do not meet CK-4/FA-4 and to use a product approved for engines with modern emissions systems.
Choosing oil for your climate and use
To pick the right oil for your truck and how you use it, consider the following:
- Normal driving vs. severe service (towing heavy loads, frequent short trips, extreme heat).
- Need for low-SAPS formulation to protect the diesel particulate filter (DPF) and catalytic aftertreatment.
- Ambient temperature range in your region to ensure reliable cold-start protection with 5W-40 viscosity.
- Compatibility with Ford’s specification and API CK-4/FA-4 for your model year.
- Availability and cost of trusted brands with proven HD-diesel performance.
Bottom line: In most cases, a 5W-40 full-synthetic diesel oil that meets CK-4/FA-4 and Ford's spec is the safest, most versatile choice for the 6.7 Power Stroke. Motorcraft remains the OEM option, while top-tier brands offer equivalent performance when labeled CK-4/FA-4.
Maintenance intervals and best practices
Follow Ford’s published guidance and use the vehicle’s oil life monitor to determine exact service intervals. Typical recommendations for synthetic diesel oils in this engine range from about 7,500 miles under normal service to more frequent changes under severe service or heavy towing. In all cases, ensure the oil is changed with the correct grade and specification, and replace the filter at each interval. Regular checks of oil level and quality help prevent issues related to contamination or overlong drains.
Summary
The best oil for a 6.7 Power Stroke is a 5W-40 full-synthetic diesel oil that meets API CK-4 or FA-4 and Ford’s specification. The OEM option is Motorcraft 5W-40 Diesel Engine Oil, but several reputable brands—such as Shell Rotella T6, Valvoline Premium Blue Extreme, and Mobil 1 ESP 5W-40—are suitable alternatives when they clearly state CK-4/FA-4 compliance. Always verify exact specifications in the owner’s manual or with a Ford dealer, adhere to recommended service intervals (often ~7,500 miles under normal conditions), and consider severe-service needs when towing or operating in extreme climates.
