Technician a says that some vehicle manufacturers recommend an ilsac grade be used in the engine. technician b says that an oil with the specified api rating and sae viscosity rating should be used in an engine. which technician is correct

Technician A is correct.

Explanation:

ILSAC, International Lubricants Standardization and Approval Committee, SAE and ASTM) the formed EOLCS, the Engine Oil Licensing and Certification System stablishing the minimum requirement for oil used in American and Japanese automobiles for fuel economy benefits offered by the new SAE 16 viscosity grade.

Ilsac certifies grades that may claim to meet an ILSAC standard. ILSAC utilizes the API's Engine Oil Licensing and Certification System (EOLCS). This is a voluntary licensing and certification program that authorizes engine oil marketers who meet specified requirements to use the API Engine Oil Quality Marks.

The API SN rating are obsolete engine oils formulated for use in cars built prior to the 1930s, it is equivalent to the new GF-5 oil rating by the International Lubricant Standardization and Approval Committee (ILSAC). SN engine oils are designated as Resource Conserving because they help improve fuel economy and protect vehicle emission system components.

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