GM dexos2™ oils are Top Tier lower SAPS¹ lubricants designed for use in high performance gasoline and light duty diesel engines where advanced aftertreatment systems such as Diesel Particulate Filters (DPFs) are used.
GM dexos2™ oils are typically high 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. (≥ 3.5cP) SAE 5W-30 and 5W-40 based on American Petroleum Institute. The primary oil and natural gas trade association in the United States. API operates a voluntary licensing and certification program that allows engine oil marketers to use the API Engine Oil Quality Marks if their products meet specific requirements. Group III base oils.
The main physical and chemical requirements for GM dexos2™ oils are shown below:
|HTHS A measure of a fluid's resistance to flow. A fluid with a higher viscosity flows less easily.||CEC L-36-A-90||cP||≥ 3.5|
|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.||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. D874||%wt||≤ 0.8|
|Phosphorus||ASTM D4951||mg/kg||700 to 900|
|Sulfur||ASTM D4951||mg/kg||< 3500|
|Evaporation loss (NOACK)||CEC L-40-A-93||%||≤ 13.0|
|Total Base Number||ASTM D2896||mgKOH/g||≥ 6.0|
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.
GM dexos2™ is usually coupled with a range of different combinations of other approvals depending on the viscosity grade of the lubricant, The most frequently seen approvals claimed in conjunction with GM dexos2™ being 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. C3, BMW Longlife-04, Volkswagen 50500/50501, Porsche C30 or A40 (5W-40 only).
For more information on GM dexos2™ oils, contact your Lubrizol representative.