2002 dodge 4.7 Engine sludge

I sometimes run different oils, I don't stick to the same one. I currently have pennzoil in there with detergents to reduce sludge. So the bottle claims. I also like the 4.7 engine in my truck. I have no complaints other than the sludge and the AC compressor clutch problems. You think I should switch to synthetic? And if I do should I seafoam it before to clean some of the gunk out of it?