The 2021 Explorer ST with the 3.0-liter EcoBoost requires 5W-30 full-synthetic motor oil that meets Ford specification WSS-M2C946-A (and the newer WSS-M2C930-A).
Beyond the basic viscosity, using oil that complies with Ford’s spec is crucial for proper lubrication, long-term engine health, and warranty eligibility. The Explorer ST’s high-performance engine benefits from a high-quality synthetic oil designed to protect turbocharged components under typical and spirited driving conditions.
Oil type and Ford spec
Key details you should know when selecting oil for the 2021 Explorer ST are listed below.
- Viscosity: 5W-30
- Type: Full synthetic motor oil
- Ford specification: WSS-M2C946-A (with newer vehicles also compatible with WSS-M2C930-A)
- Oil compatibility: Suitable with API SN or newer and ILSAC GF-6 approved oils that meet Ford’s spec
- Recommended brands (examples): Ford Motorcraft Ultra Synthetic 5W-30, Castrol EDGE 5W-30, Mobil 1 5W-30, Valvoline Advanced Full Synthetic 5W-30
Following these specifications helps ensure optimal protection for the Explorer ST’s turbocharged engine and supports smooth performance across temperature ranges.
Capacity and maintenance intervals
Information about how much oil your engine uses and how often to change it is essential for ongoing maintenance.
- Oil capacity (with filter): approximately 6 quarts (exact amount listed in the owner’s manual or under-hood specification label)
- Recommended change interval (normal driving): typically about every 7,500 miles or 12 months, whichever comes first
- Severe conditions guidance: more frequent changes, commonly around 5,000–7,500 miles or 6 months
Always verify the exact capacity and interval in your owner’s manual or on the under-hood oil specification sticker, as conditions and driving styles can affect maintenance needs.
Practical tips for keeping your oil up to the mark
To stay aligned with Ford’s recommendations and protect your investment, consider these pointers when servicing your Explorer ST:
- Use only a full-synthetic 5W-30 that bears Ford’s WSS-M2C946-A or WSS-M2C930-A compatibility.
- When in doubt, opt for oils certified by the major brands that explicitly list Ford specification compatibility.
- Keep receipts and document oil changes for warranty purposes.
In short, the right oil for the 2021 Explorer ST is a 5W-30 full synthetic that meets Ford’s spec, with maintenance intervals guided by driving conditions and official recommendations.
Summary
For the 2021 Ford Explorer ST, use a 5W-30 full-synthetic oil that meets Ford specification WSS-M2C946-A (or the newer WSS-M2C930-A). Check the owner’s manual for exact capacity and interval guidance, and select brands that explicitly conform to Ford’s spec. Following these guidelines helps ensure optimal engine protection and performance.