[h=1]API SN Engine Oil Category[/h]In 2010 the American Petroleum Institute introduced a new engine oil category under the nameAPI SN and a new supplemental category called Resource Conserving.
The API SN category is an improvement over the API SM category in the following areas:
- High temperature deposit protection for pistons
- Better sludge control
- Better seal compatibility
- Aftertreatment compatibility
This means that API SN compares to API SM like this:
The Resource Conserving supplemental category requires further properties. The former supplemental category, which was called Energy Conserving required only fuel saving properties from the oil. Resource Conserving requires further properties like:
- emission system protection
- turbocharger protection
- compatibility with engines operating on ethanol containing fuels, up to E-85
The requirements of API SN with the Resource Conserving supplemental category are identical to the requirements of the ILSAC GF-5 standard.
[TD]Service typical of indirect-injection diesel engines and other diesel engines that use a broad range of fuel types, including those using fuel with high sulfur content; for example, over 0.5% wt. Effective control of piston deposits, wear and copper-containing bearing corrosion is essential for these engines, which may be naturally aspirated, turbocharged or supercharged. Oils designated for this service have been in existence since 1994 and may be used when API Service Category CD is recommended.[/TD]