Ford Focus Engine Oil — Grade, Capacity & Recommendations (2018-2024)
Oil Specification by Engine
| Engine | Oil grade | Ford specification | Capacity (inc. filter) |
|---|---|---|---|
| 1.0 EcoBoost (petrol) | 5W-20 | WSS-M2C948-B | 4.1 L |
| 1.5 EcoBoost (petrol) | 5W-20 | WSS-M2C948-B | ~4.8 L |
| 1.5 EcoBlue (diesel) | 0W-30 | WSS-M2C950-A | 3.8 L |
| 2.0 EcoBlue (diesel) | 0W-30 | WSS-M2C950-A | ~6.4 L |
All four engines require a full-synthetic, low-SAPS oil. Figures marked “~” are approximate — confirm against your owner’s manual, as capacities can vary slightly by build date.
Not sure which engine you have? Check section D.2 of your V5C logbook for the engine code, or look at the badge on the tailgate.
Recommended Engine Oils
For petrol EcoBoost engines — 5W-20, WSS-M2C948-B
Comma Eco-F 5W-20
Carries the Ford WSS-M2C948-B approval; designed specifically for EcoBoost wet-belt petrol engines.
Mobil Super 3000 Formula F 5W-20
Full-synthetic 5W-20 meeting Ford WSS-M2C948-B for 1.0 and 1.5 EcoBoost engines.
For EcoBlue diesel engines — 0W-30, WSS-M2C950-A
Castrol Magnatec 0W-30 D
Meets Ford WSS-M2C950-A; low-SAPS formulation that protects the DPF on EcoBlue diesels.
Fuchs Titan GT1 0W-30
Full-synthetic 0W-30 approved to Ford WSS-M2C950-A for 1.5 and 2.0 EcoBlue diesels.
Petrol or Diesel: Which Oil Does Your Focus Need?
The two halves of the Focus range are engineered around different oils. The EcoBoost petrol engines (1.0 three-cylinder and 1.5 four-cylinder) use a thin, low-friction 5W-20 to Ford WSS-M2C948-B. That grade is not just about economy: these engines run a timing belt immersed in oil (a “wet belt”), and the specified low-SAPS chemistry is designed to protect it. A thicker or non-approved oil can accelerate belt wear.
The EcoBlue diesel engines (1.5 and 2.0) use 0W-30 to WSS-M2C950-A — a very low-SAPS oil that keeps the diesel particulate filter (DPF) clear. Putting a petrol-spec oil in a diesel, or vice versa, risks real damage.
In the grade itself, the first number (0W or 5W) is the cold-start flow rating and the second (20 or 30) is how thick the oil stays when hot. Match the full grade and the WSS specification for your engine.
Oil Change Intervals
Ford services the Mk4 Focus on a time-or-mileage schedule — in practice every 12 months, or when the dashboard service indicator calls for it. Depending on engine and how the car is used, the mileage interval falls roughly between 10,000 and 18,000 miles. If you mostly do short urban journeys, or you run a diesel EcoBlue, change the oil toward the shorter end to protect oil quality and the DPF.
Tip: always fit a new oil filter when you change the oil — an old filter restricts flow and contaminates fresh oil immediately.
How to Check Your Oil Level
Step 1: Park on level ground and wait at least 5 minutes after turning off the engine.
Step 2: Remove the dipstick, wipe it clean, reinsert fully, then remove again to read the level.
Step 3: The oil level should be between the minimum and maximum marks. Top up in small amounts if needed.
Frequently Asked Questions
Does a petrol Ford Focus use the same oil as a diesel?
No. The 1.0 and 1.5 EcoBoost petrol engines take 5W-20 to Ford WSS-M2C948-B, while the 1.5 and 2.0 EcoBlue diesels take 0W-30 to WSS-M2C950-A. Always match your engine’s specification, not just the viscosity number.
How much oil does a Ford Focus take?
It depends on the engine: roughly 4.1 L for the 1.0 EcoBoost, around 4.8 L for the 1.5 EcoBoost petrol, 3.8 L for the 1.5 EcoBlue diesel and about 6.4 L for the 2.0 EcoBlue — all including a filter change. Confirm the exact figure against your handbook.
Can I use 5W-30 instead of the recommended grade?
Only if it meets your engine’s Ford specification. The EcoBoost petrol engines are designed for low-friction 5W-20 (WSS-M2C948-B); a thicker 5W-30 can increase wear on the wet timing belt and slightly raise fuel consumption. Stick to the specified grade.
What does WSS-M2C948-B mean?
It is Ford’s own oil approval for its EcoBoost petrol engines — a low-SAPS 5W-20 with a specific low-friction profile that protects the oil-immersed timing belt. WSS-M2C950-A is the equivalent approval for EcoBlue diesels (0W-30).
Other Ford Focus Guides
How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →