Toploader oil rating?

[RJacobsen]

I went through this a few years ago with the daughters sand rail. From what I understand the GL-5 is harmful to all yellow metals. Don't know what if any yellow metals are used in a T-loader but if any I would be sure before using.

Maybe Butch will chime in.

I presume that brass would be a yellow metal and seems to me that the syncro rings are brass