Hey Guys. I know pretty much nothing about GM motors, my brother is 19 years old, he is a lotboy for the local chevy dealer. He picked up a 2000 grand am se with the 3.4L V6 motor, he got a real good deal on it, it was a trade in vehicle. The car has like 70k miles on it, and it carries a 5w30 oil recommendation. I took a peek in the crankcase, its pretty clean but it shows a little varnish. We are going to clean it up with autorx. After we clean it up with autorx, what oil do you guys recommend? I was thinking Motorcraft 5w30 (semi syn).