diff oils !

Hi, im sure its covered hundreds of times but fedup of searching hundreds of answers, been to euro car parts for diff oil, tripleqx 75w90, 37quid for 5 litres, seen ls 75w90 synthetic gl4/5 on fleabay for 27, seems what i can make out is i can use lsd oil in diffs as it has ep additives anyhow, that correct or wrong? Thanks

id have thought youd get a 75w90 for 20 for 5 litres,though that would do

Thanks james, was just unsure of oils because of the additives , got either fleabay or eurocar parts to deal with and no difinitive answers, im trying to upgrade things to best i can as i go along!

theres only a few teeth and bearings in the diff,so no special worries as in some