So how does synthetic oil help on the lifters chattering?????

I could see something like 50 weight oil would help because more oil would get to the top, but I thought synthetic oil was thinner....

What is a good oil to try? I will also try the bettter gas next tank.
I did get the plugs changed and we are getting 22mpg with it so that part is good.


1994 Ford Explorer 5.5 Superlift, 35's no-slip in the rear, lots of custom parts ( sliders, tire rack & more)
2003 Kia Sorento
1987 Suzuki Samurai for our son and wife