gearbox oil

[dehne]

hi there just wondering wgat would be the best oil to use in the gearbox
now it is a 85 mdl 2.5 90 box but it now has a lsd diff in it so when im putting in i figure but new oil into i found a castrol one for lsd's but it also said not recomended for syncro boxes
and with the billions of years of knowledge one here the answers will be plentiful
 thanks all

[MD]

Transmission Fluids for the any Alfa  Transaxle with a limited slip differential.

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-5 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

Mobil Street/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

[dehne]

cool thanks heaps for that now just need to decide which one

[DaveB]

I've got my TS properly back on the road & driven about 1500 klm since some work in the ACT.

The mechanic in Canberra was reluctant to do a gearbox rebuild to address the 1-2 syncro problem, & instead recommended tightening the linkage joins + using Redline superlight shockproof gear oil. It's fully synthetic, costs a bomb, but works a treat & much cheaper than a gearbox rebuild. Stoked, it's a far better gearchange now.

Great result from this oil, better than any other I have used in the last 12 years on TS & 3L 75's, and that includes many of those above.
Recommend it very highly.

DaveB