I just bought a 2009 Road Glide which has HD oil in transmission. I have a couple of quarts of Spectro GL-1 for 5-speeds (used it in my 2006 RK).. Will it hurt to use the GL-1 in the 6-speed transmission of my 09 rosd glide???? That's until I order and get the GL-5 stuff!
It won't hurt it but it isn't the best protection for the 09 with the helical gears.