I have only had my car since the end of June. I assume that it has seen regular oil all of it's life, and the past 3 oil changes I've given it have been with regular oil. I've been reading about how much better synthetic and synthetic blends are, and was wondering if I should start putting synthetic in it. I've heard other things about using synthetic after the car's been ran on regular oil for all it's life does nothing. My car has about 120K on it now, and I'm just wondering if when it's time to change my oil again, if i should start using synthetic or not.