I have a 2005 Buick Century that is used for short trips to school , work , errands , etc. with average length of trip 6 to 10 miles , 90% suburban driving and approx. 12K miles a year usage (rarely gets out on the highway ). I am looking to only change the oil on this car once every six months / 7,500 miles . Will Mobil 1 EP 5W 30 buy me any added protection over Mobil 1 5W 30 for the above car & driving conditions ?