The answer depends on how long you’ll have the car. If you plan on keeping it for a while (90,000+ miles) and you drive in lots of urban traffic, change the oil every 5,000 miles. Turbo engines are very hard on oil and need more frequent oil changes in general. If your car lived on the highway and did lots of very long trips I’d bump it up to 7,500 miles, but 10,000 miles makes me uncomfortable with that motor. Are you sure that car calls for 10,000 mile oil changes under the “severe service” category in your owners manual? Synthetic oil is good, but it uses the same types of additives that standard oil does and they eventually wear out.