The shop where I have my car serviced has been urging me to change my oil in my 2013 Mustang GT California Special more often. I've owned this vehicle since May 2012 and have 11K miles on it. Since I don't have time to drive it much I change the oil once a year since Ford recommends every 10K. The question is should I change it more often or is once a year with synthetic oil okay? Thank you, Russell in San Jose Answer: Russell, modern engine oils and engine technology allow for the 10,000 mile oil change intervals. Keep in mind the manufacturer also offers a powertrain warranty for up to 100,000 miles so a 10k oil change interval is not harmful under “normal” conditions. If your trips allow the engine to fully warm up and the oil temperature to get over 200 degrees regularly to evaporate moisture, you’re probably just fine. Keep in mind the manual says to start the engine every 15 days and allow it to reach normal operating temperature. Ford puts particular emphasis on their oi...