| ACEA |
Association des Constructeurs Europeens de L’Automobile |
| Antiwear additives |
Additives or their reaction products, that form thin, tenacious films on highly loaded parts to prevent metal-to-metal contact and wear |
| API |
American Petroleum Institute |
| cDPF |
Catalysed DPF |
| CRT |
Continuously Regenerating Trap |
| Detergent |
An additive to keep engine parts clean. These are normally metallic soaps with a reserve of basicity to neutralise acids formed during combustion. |
| Dispersant |
An additive that helps keep solid contaminants in the oil in a colloidal suspension, preventing sludge and varnish. |
| DOC |
Diesel Oxidation Catalyst |
| DPF |
Diesel Particulate Filter |
| EGR |
Exhaust Gas Recirculation |
| HDDO |
Heavy-Duty diesel oils |
| HTHS |
High Temperature High Shear, a measure of an oil’s resistance to flow under conditions resembling highly loaded journal bearings in a combustion engine |
| LNC |
Lean NOx Catalyst |
| LNT |
Lean NOx Trap |
| Mineral basestock |
Lubricating fluid made from the process of refining crude oil. |
| NSRC |
NOx Storage Reduction Catalyst |
| OEM |
Original engine manufacturer |
| PCMO |
Passenger car motor oils |
| PDSC |
Pressure Differential Scanning Calorimetry |
| SCR |
Selective Catalytic Reduction |
| Sulphated ash |
The ash content of an oil, determined by charring the oil, treating the residue with sulphuric acid and evaporating to dryness. This is a measure of the metal containing components in the oil |
Synthetic basestock
|
Lubricating fluid made by chemically reacting materials of a specific chemical composition. |
| TBN |
Total Base Number,a measure of the basicity of an oil. Calculated from the amount of acid needed to neutralise the oil’s basicity. |
Type approval
|
Defines the process by which an engine design is tested and approved as meeting the requirements of a directive. |
| ZDDP/ZDP/ZDTP |
Zinc Dialkyl Dithio Phosphate, a typical antiwear additive. |