Different regulations. EU has mandates we do not. Ex German synthetic oil must be group 4 vs g3. Notice that only in the US does the manual say 5w30 oil where as non-US allows for 40w. Is the engine different? Nope.
7500 mi is fine with a quality synthetic and street driving. 10k could work but me personally I would work my way up there with uoa tests to measure TBN and TAN. 7500 on my z has shown to be fine. I stay there for warranty purposes only.
Unless racing, using a a very cheap oil with poor add pack, or tinkling in your sump 3k is a waste of money. Walmart superflo SN will give you 5k easy.
- b