This is an amazing list of specific brands and viscosity's that includes a current outdoor temperature range for all viscosity's. Notice that 30 weight oils are not recommended for AMG engines. Also note that oil additives are expressly prohibited but a gasoline additive is actual recommended on pg.15.
http://www.theworkshopmb.com/TheWorkshopMB_MBZ_FactoryApprovedServiceProducts.pdf
http://www.theworkshopmb.com/TheWorkshopMB_MBZ_FactoryApprovedServiceProducts.pdf
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