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A. Shell Helix Ultra Professional AG 5W-30 is designed for high-performance General Motors gasoline and diesel engines and those requiring API SN or ACEA C3. It is formulated specifically for the GM dexos2 specification.
A. Yes, Shell Helix Ultra Professional AG 5W-30 is approved against the General Motors engine oil specification GMW16177 (dexos2™).
A. API and ACEA are the universal lubricant performance standards every reputable oil meets. They are your baseline check — match the code your handbook specifies (e.g., API CI-4 or ACEA E7 for heavy-duty diesel) and the oil is technically suitable for your machine. Every oil on our site lists its API and ACEA classifications.
A. Shell Helix Ultra Professional AG 5W-30 meets ACEA C3 and API SN.
A. Yes, Shell Helix Ultra Professional AG 5W-30 is suitable for Vauxhall and Opel vehicles requiring GM dexos2, since Vauxhall and Opel were General Motors brands using GM specifications during the dexos2 era.
A. GM dexos1 (and dexos1 Gen2) is the specification for gasoline-engine GM vehicles. GM dexos2 is the specification for European GM diesel and gasoline engines, requiring ACEA C3-class low-SAPS chemistry. Shell Helix Ultra Pro AG (this product) covers dexos2; Shell offers separate products for dexos1 Gen2.
A. An OEM Specification is the lubricant requirement set by a vehicle or equipment manufacturer (e.g., MB 228.3, VW 504.00). When an oil lists the code, the oil manufacturer has developed and tested it to meet the criteria the equipment manufacturer requires. Match the code in your handbook and you have a lubricant engineered for your machine.
A. An OEM Approval means the oil has been formally tested and signed off by the equipment manufacturer and listed on their official approved-products register (e.g., MB-Approval 228.3). An Approval confirms the oil is recognised by the equipment manufacturer for service use in their machines.
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