Is anyone using synthetic oil? I have been using 30 weight non detergent oil in my car forever. Last year I started adding 1 qt. of detergent when I changed the oil. I finally made the full switch over to regular detergent oil but I also used 10w-30 synthetic. The first thing I noticed when I started the engine was instant oil pressure. It also seems to run a little quieter and some of the smoking from the tailpipes went away. So far I'm very happy with it. The downside is I need to change the leaking oil pan gasket because the thinner oil seems to drip a little more, but, I was going to do that anyway so I can clean out the pan.