3,000 miles? 4,500, 6,000, 10,000, 15,000? How often do you change your oil? 3,000 miles for conventional oil and 5,000 miles for  synthetic oil has always been a rule of thumb, but a  2010 BMW in the shop has an oil change reminder light that doesn’t come on for 15,000 miles! Most cars today are [...]Full Story »