Been running supertech 5w20 in my 96 civic hx 5 speed since I bought it with 133k miles. Has 155k now. Just changed to syntec black bottle 0w40. I mentioned a while ago that I got 3 jugs for $10/ea on clearance at Autozone and said I would update once I changed the oil. I just put a few miles on it around town. Seems to have quieted the valve train noise but I can't tell if it's going to affect mpg. Spec was 5w30 but was back spec'ed to allow 5w20. Was using some oil between changes. I was doing 5k oci but this one was about 4K because I had a bit of spare time and we'll be moving soon. I'll see how the car feels during the next few workdays.