Had one of these cars, tried all the different combinations. In the end the result was it did best on the correct oil weight which was 5W30 dyno oil. Brand did not really matter. High mileage oil can't hurt but not sure it will slow anything down. Same with thicker oil such as Rotella 5W40 which made no difference for me. On mine I changed the oil at 3k intervals because after that it burned the oil, till 3k it was happy with leaving the oil alone for whatever reason. Just my .02