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My car was set at 11kmiles, not 15kmile and I'm in California. I will change mine followed the manufacture setting.
I've owned a Honda Accord V6 for 5 years and changed oil (Honda oil, not synthetic) every 5000-6000 miles. There was no single problem until I sold it in May 2005. The engine ran so quiet still then. My dad, a mechanic, changed oil for me every time and he was amazed that the oil looked still good at 5-6Kmile. With BMW synthetic oil, it makes sense to change at 11Kmile. So, I would not waste my time and money to change oil before the preset date.
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