What's the good oil for LSD 116 trannies ?

[MD]

Well I guess I started this topic so I should make a contribution as well. I have been doing some homework talking to oil company tech departments and chemical engineers. The topic is certainly as complicated as you want to make it. However I have distilled my findings into this chart which may be helpful to anyone who need it.

Transmission Fluids for the Alfa 75 Twin Spark Transaxle

1.   Australian Alfa Romeo Dealership recommendations.

   (TBA if and when it arrives)**

2.   The 75 owner's manual. SAE 75W-90 API GL-5
No distinction is made for an open or limited slip differential in the  manual. Lubricants recommended :-

Agip        Rotra SX SAE 75W-90         >now LSX 75W-90
Shell        Spirax 80W-90HD           > now Spirax A80W-90
IP Pontiax  HDS 75W-90

3.   Oil company recommendations

Penrite,        Street-   Transaxle        75W-90    GL-5      Semi synthetic
                            Racing-   Sin Gear Oil      75W-90 GL-5/6   Full synthetic

Valvoline   Street/Race   Duragear 75W-90    GL-4      Semi synthetic

Shell          Street      Spirax     A80W-90   GL-5      Mineral
                  Racing           XGO          75W-90   GL4&5   Synthetic

Agip           Street/race   Rotra LSX 75W-90   GL4&5   Synthetic

MobilStreet/race   Delvac synthetic gear oil 75W-90   Synthetic

Redline        Street/race    Light/ Superlight 75W90NS GL-5   Synthetic
                       Street      Heavy Shockproof,          Synthetic
                            Race      Lightweight Shockproof,      Synthetic
                            Race      Superlight Shockproof.      Synthetic


Please note that obviously this is not a complete list of lubricants that are available and undoutbtedly there are many more that I have not been made aware of but it should get you in the ballpark whether it is for street or the track.

Compiled by MD
05.June.2009

**
Don't hold your breath for this information. Five out of five Australian dealerships that I wrote to have failed to respond in any form whatsoever. With that level of brand committment and support, one could call that disapponing or a disgrace depending on your mood at the time.

Alfa Italy took 24 hours to make the referral.   

[MD]

Anybody used a Motul oil such as:-

Gear Competition 75W-140 or GEAR LS 75W-90 both synthetic in a transaxle with LSD ?
If so, what is your opinion of it?

[brook308]

Richard Anderson recommended Redline Lightweigh Shockproof (aka Smurfs Blood) to us when we built up two LSD transaxels for race/sprint.

No complaints, very good shifts, no synchro issues.
Have also used this GB oil in a 308 ferrari transaxel where it cured a cold slow 2nd synchro.
Have pulled apart GBes that have had this oil and it clings to the internals like sh1t to blanket.
Pretty expensive but can be reused and being a full synthetic will last well.

[brook308]

Richard Anderson recommended Redline Lightweight 75w90 NS to us when we built up two LSD transaxels for race/sprint.

No complaints, very good shifts, no synchro issues.
Have also used this GB oil in a 308 ferrari transaxel where it cured a cold slow 2nd synchro.
Have pulled apart GBes that have had this oil and it clings to the internals like sh1t to blanket.
Pretty expensive but can be reused and being a full synthetic will last well.

Apologies, the good stuff is Redline Lightweight Shockproof gear oil, also known as Smurfs Blood for its colour. Will ammend my previous post.