MB229.71 is a new addition to the range of active Daimler specifications and represents an improvement in fuel economy performance when compared to previous Daimler specifications. This is driven by continued pressures on OEMs to improve vehicle fuel efficiency to meet tightening CO2 Mobile sources - Pollutant exhaust gases created by the combustion of fuel. Water and CO2 are not included in this category, but CO, NOx, and hydrocarbons are and are thus subject to legislative control. All three are emitted by gasoline engines, while diesel engines also emit particulates that are regulated. Stationary sources - The release of sulfur oxides and particulates from power stations that can be influenced by fuel composition. Local authorities control the sulfur content of heavy fuel oils used in such applications. legislation which will come into force in 2021.
Engine lubricants approved to MB229.71 are premium lower SAPS1 lubricants typically aligning with a baseline level of performance as defined in European Automobile Manufacturers Association (Association des Constructeurs Européens d'Automobiles). The primary automotive standards organization in the European Union, ACEA defines performance specifications for automotive lubricants. C5-16. They are designed for use in high performance gasoline and light duty diesel engines where advanced aftertreatment systems including as Three-Way Catalysts (TWC), Diesel Particulate Filters (DPFs) and more recently Gasoline Particulate Filters (GPFs) are installed.
The main physical and chemical requirements for MB229.71 are shown below:
|High Temperature High Shear. A measure of a fluid’s resistance to flow under conditions resembling highly-loaded journal bearings in fired internal combustion engines, typically 1 million s–1 at 150°C. A measure of a fluid's resistance to flow. A fluid with a higher viscosity flows less easily. at 150°C||CEC L-36-A-90||cP||≥ 2.6 and ≤ 2.9|
|The measurement of a fluid's resistance to flow under the force of gravity at a specific temperature, usually 40°C or 100°C. at 100°C||American Society for Testing and Materials. An organization that develops international standards for industry, including test methods, specifications, and best practices. Many tests that certify a lubricant to a specification are overseen by ASTM. D445||cP||≥7.8|
|A product of the combustion of metals commonly found in detergents. As a lubricant property, sulfated ash content is a measure of metal content (usually Zinc, Calcium, and Magnesium) and allows formulators to stay within specified limits in order to minimize the negative effects of abrasive ash particles. Sulfated ash is determined by charring the oil, treating the residue with sulfuric acid, and evaporating to dryness, the result being expressed as % by mass.||ASTM D874||%wt||≤ 0.8|
|Phosphorus||ASTM D5185||%wt||≥ 0.07 and ≤ 0.09|
|Sulfur||ASTM D5185||%wt||≤ 0.3|
|Evaporation loss (NOACK) at 250°C||CEC L-40-93||%||≤ 11|
|Total Base Number||ASTM D2896||mgKOH/g||≥ 7.5|
Note 1: SAPS refers to Sulphated Metallic deposits formed in the combustion chamber and other engine parts during high-temperature operation., Phosphorus and Sulfur, the levels of which are often restricted in the latest performance specifications.
Engine lubricants approved to MB229.71 are required to have a high temperature high shear rate (HTHS) at 150°C of between 2.6 and 2.9cP and are commonly referred to as low HTHS lubricants. MB229.71 also allows either SAE 0W-20 or 5W-20 lubricants to be approved,
For more information on MB229.71 oils, contact your Lubrizol representative.