Can anyone tell me why in USA G35 engine oil change intervall is 3750-7500 miles, but in EU Nissan 350Z oil change intervall is 9500 miles?

 

The European Union has stricter in emission laws which includes the oil laws. I could go into details specifying exactly but in the end it just boils down to emission standards and requirements. And the the European Union has always had stricter emission standards

 

Does it means oils produced and selled in EU are better quality than in US market?

 

You sure the EU interval is miles and not kilometers?

 

He probably converted it. But this one specific article I was reading mentioned that the European Union has stricter laws regarding terms like synthetic oil. And how is the find versus here in the US there is no clear-cut definition set with the government

 

15000 km. is EU interval
in US it is 9320 miles.