Oil-Ford uses its own WSS (World Specification Standard) system for engine oil approvals. Each Ford engine has a specific WSS code that defines the exact oil chemistry required — getting it wrong can damage your wet timing belt, clog your DPF, or void your warranty.
WSS-M2C948-B — EcoBoost Petrol (5W-20)
WSS-M2C948-B is Ford's specification for the 1.0-litre three-cylinder EcoBoost engine. It requires a low-SAPS SAE 5W-20 oil with very specific low-HTHS (High Temperature High Shear) viscosity — engineered to reduce internal friction and protect the wet timing belt that runs submerged in oil on earlier models. Using a generic 5W-20 without this approval risks accelerated belt degradation. This is the most critical Ford oil spec to get right.
WSS-M2C913-D — Older Diesel & Petrol Engines (5W-30)
WSS-M2C913-D is Ford's long-standing specification for most pre-2014 petrol and diesel engines in Europe. It requires SAE 5W-30 and maps broadly to ACEA A5/B5 performance levels. This spec covers the 1.6 TDCi, 2.0 TDCi (older models), and various Duratec petrol engines. If your Ford was built before 2014, this is likely the spec you need.
WSS-M2C950-A — Modern Diesel (0W-30)
WSS-M2C950-A is Ford's specification for newer Euro 6 diesel engines from 2014 onwards, including the 1.5 EcoBlue, 2.0 EcoBlue, and Ranger diesel. It requires SAE 0W-30 and provides enhanced DPF protection with very low SAPS content. If you can't find a WSS-M2C950-A oil, Ford allows ACEA C2 SAE 0W-30 as a temporary alternative.
Which Ford Oil Spec Do I Need?
The simplest way to check is your owner's manual or the oil filler cap. As a guide: all 1.0 EcoBoost engines need WSS-M2C948-B (5W-20), older TDCi diesels need WSS-M2C913-D (5W-30), and newer EcoBlue diesels need WSS-M2C950-A (0W-30). The spec matters more than the brand — Ford's official partner is Castrol, but any oil with the correct WSS approval is equally suitable.