I know there's a few gearheads on here so I wanna get some opinions. I've got a blazer with over 150,000 miles on it. I run standard oil in it with no problems. However, I'm changing the tranny fluid again soon as well as the diff oil for the first time. I'm debating between Lucas, Amsoil, and Mobile 1 (all synthetic). What's been yall's experience/research with those three brands?