CAN2-3.5-M79

This Standard applies to two types of gasoline to which no lead or phosphorus have been added and are therefore suitable for use under all climatic conditions in spark ignition engines equipped with emission control systems requiring the use of unleaded gasoline. In the interest of conservation of petroleum products it is essential that engine manufacturers continue to design engines to operate on Type 2 gasoline. Type 1 is then reserved for cases where octane requirement increase in use is such that a higher octane gasoline is required to prevent excessive knock.