Shell Mysella S5 N 15W-40 is a high performance quality oil blended for use in highly rated, 4 stroke, spark ignition engines which require a 'low ask' oil. Shell Mysella S5 N satisfies the new generation of stationary gas engines designed to meet the emerging legislation limiting emissions of NOx and those which employ the latest 'lean' or 'clean' burn technology. Shell Mysella S5 N is specially developed to provide extend drain intervals in those natural gas engines where oil life is a limiting operational factor.