Deuskid
Active member
I understand what you are saying @Woodsman74881Gl 4 non ferrous safe. Gl 5 only non ferrous safe if it is specified that way. I trust Royal Purple. And amsoil. Quality products. Yes you can use the same in all. GL4/5. Non ferrous safe. Royal Purple. Look at their website for more information
don't understand what you are asking.
CJ2rox wrote 'GL4 and GL5 are location specific'. I didn't understand what he means by that?
Later posts cleared it up for me.