Any oil spec experts.. Api vs acea?

[DuraAce]

If a car (petrol) says it needs API SM 5W30 spec oil is ACEA C3 a suitable alternative?

Is it better or worse than SM? Or does anyone know the correct ACEA equivalent?

[FredClogs]

There's a stick thread in General Gassing on which which Opie the oil man gives advice.

[DuraAce]

Oohh you're right. I shall post my question in there.

Feel free to delete this one please mods....