Ok ... I just found out some bad news, and I wanted some good advice.
I've got a '91 XJ, with an AX-15 manual tranny. It has brass synchro rings. The owner's manual calls for GL-5 gear oil.
I just read that was a mistake ... they ran that info for about 2 years, then changed it to GL-3 oil.
Turns out, the sulfur and sulfite additives in the GL-5 grade oil eat up the brass synchros.
Anybody else heard that?
What about redline MT-90? is that good? Will it do any damage? Thanks in advance ... any info would be appreciated ... even if it's not directly related ... :-)