Low-Ash Oil for Engines with After-Treatment
For engines with a diesel particulate filter, selective catalytic reduction or an exhaust gas recirculation duty that limits ash, phosphorus and sulphur.
Features
- Ash-forming additives are limited so that filter regeneration intervals stay as designed instead of shortening year on year.
- Using a standard high-ash oil in such an engine blocks the filter with incombustible ash that regeneration cannot burn off.
- Lower base number than a conventional heavy-duty oil, which makes low-sulphur fuel a condition rather than a preference.
- Suited to newer construction plant and road vehicles working under emissions limits, and to generating sets fitted with after-treatment.
- Worth standardising on across a mixed fleet where some machines have after-treatment and some do not, because it is the safer error.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Viscosity grade | 10W-30 / 5W-30 | lower grades are common on after-treatment engines for fuel economy | |
| Sulphated ash | 0.8 maximum | % m/m | the property that protects the filter |
| Phosphorus | 0.08 maximum | % m/m | limits catalyst poisoning |
| Sulphur | 0.3 maximum | % m/m | part of the same after-treatment limit set |
| Fuel sulphur requirement | 10 maximum | mg/kg | a low-ash oil on high-sulphur fuel runs out of base reserve early |