do ea82 transmissions have brass syncros

[earthquakebase]

the fwd gbox getting pretty noisy so im gonna change the oil and maybe add something to it not sure what, n try make it last as long as possible. everyone here seems to use gl5 80w/90. i remember hearing from people that there is sulphur in gl5 oil and this can damages the brass syncros in a gearbox. dunno if this is a myth and im not tryna say anyone is wrong just asking a question