If it's registered in another state, then he can drive it in CA immediately - no need for 7500 miles
From the CA DMV website.
The Bottom Line
If you are a California resident and acquire a new car, truck, or motorcycle from another state, it must be certified to meet California smog laws to be registered in California. This includes certain diesel-powered vehicles. DMV cannot accept an application to register a vehicle in California that does not qualify for registration (California Health and Safety Code §§43150 - 43156).
What Is Considered a New Vehicle?
California considers any vehicle with less than 7,500 miles on the odometer at the time of purchase or trade by a California resident or business, to be a new vehicle. This is true whether or not the vehicle has been registered in another state.
They won't let you register a 49 state vehicle if it is new. You need to register it and drive it 7500 miles to not be new and register in CA.
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