Well, 5,000 miles with Amsoil 75/110 in my differentials and now I'm getting shuddering when I make tight turns from a dead stop..... Any ideas anyone? I never had this problem before! Should I add the additive? Please help, I'm starting to get P!ssed off here... . It is getting worse and more consistant with all tight turns left and / or right. Is it possible that my balding tires are to blame? I 'm planning on changing them later in the summer..... For now I'm running the snot out of them. Any and all comment and / or suggestions welcome.