European Engine Oil Technology

Glossary

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.