What Is a DPF?
A Diesel Particulate Filter (DPF) traps soot particles from exhaust gases. Periodically, the trapped soot is burned off in a process called regeneration. This requires temperatures above 600°C. Any oil that produces high ash levels can clog the DPF and prevent regeneration.
What Is Low-SAPS Oil?
SAPS stands for Sulphated Ash, Phosphorus, and Sulphur. Low-SAPS oil produces minimal ash when burned, keeping the DPF clean. Oil specifications that mandate low-SAPS include:
- ACEA C1, C2, C3, C4, C5 (European standard)
- VW 507 00, 509 00
- BMW LL-04
- MB 229.51, 229.52
- PSA B71 2290
- Ford WSS-M2C913-D
What Happens With the Wrong Oil?
Using non-DPF-safe oil in a diesel with a DPF causes:
- Ash accumulation that cannot be burned off
- DPF blockage and failed regeneration cycles
- DPF warning light and limp mode
- Premature DPF replacement (£1,000–2,500+)
Frequently Asked Questions
How do I know if my car has a DPF?
Almost all diesel cars sold in the UK since 2009 have a DPF. Check your handbook or look for a DPF warning light on your dashboard. Our oil finder tells you whether DPF-safe oil is required.
Can I use C3 oil in a C2 engine?
Not always. C2 and C3 have different SAPS levels and friction characteristics. Use the exact ACEA rating specified by your manufacturer.
Is C3 oil the same as low-SAPS?
C3 is mid-SAPS rather than low-SAPS. C1 and C2 are lower SAPS. C3 is suitable for most DPF-equipped vehicles unless the manufacturer specifically requires C1 or C2.
