no additive or additive is the big Q - if I take the precaution and add it would it hurt??our LSDs are torsen type which use worm gears and dont need any additives to motivate the gear oil to stick and move about. limited slip friction modifier are mainly used in clutch type LSDs.
any GL-4/GL-5 rated gear oil (wt: 75w/80w/85w90 to w90 depending on climate) will do in our rear ends, regardless if its open or LSD.
did you read the whole thread? or just decided to selectively read that one post? as stated in that thread: GL-5 has additives for LSD equip cars. also stated in this thread: the other additives for clutch type LSDs need not apply for our torsen LSD...no additive or additive is the big Q - if I take the precaution and add it would it hurt??
So I could get away with just the oil - I went back to the DIY and found this "For people who have LSD, plan on purchasing a bottle of GM limited slip additive. Add this first, then add the differential fliuid until the diff is full. Thanks to Alexus_300 for this info."
^This. Although i heard the manufacturers added it to reduce chatter. Again, i don't think that applies to our Torsion diff either. The small amount of additives in regular diff oil is enough. Even the websites selling this stuff mentions Posi rear ends only.Which baffles me because its completely unnecessary in a helical limited slip. Anyone who even remotely knows how the two different types of differential (helical versus clutch type) would understand that additives are for clutch type and their clutch disk friction surfaces. All the limited slip additives in the world wont make a difference on a helical. I would even argue that it could be detrimental to the longevity of the helical diff.
Seriously....not needed. Pretty much ANY GL-5 75w90 these days will have SOME limited slip additive in them. But I assure you, it is far from necessary in the IS300.
I'll correct you like a jerk....^This. Although i heard the manufacturers added it to reduce chatter. Again, i don't think that applies to our Torsion diff either. The small amount of additives in regular diff oil is enough.
lol, well deserved, thanks Tom. I don't know why i spelt it torsion when i knew better. Meant Torsen, no additives needed.I'll correct you like a jerk....
Torsion - Twisting force or motion
Torsen - TOR-SEN TORque SENsing differential. Its a name brand of helical style differentials. Modpwnt.