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The prefered oil is TUTELA TRANSMISSION GEARFORCE.
You can use whatever you want given that it meets the below properties:
Type: Synthetic
Viscosity: SAE 75W
Meets classification: FIAT 9.55550-MZ6

Double check your user manual just in case.
 

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Fuchs Titan Sintofluid FE 75W is what I put in mine, several people on here use it as well as a well known specialist.
 

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Cheers for the info
Giulietta uses C635 gearbox. I had difficulty engaging third and sometimes first gear. After consulting with Ned of Autolusso, I changed the gearbox oil to Fuchs Titan Sintofluid FE 75W and put in 3 ltrs. The problems with engaging gears has improved significantly, especially the third gear :) I'm quite happy with the result.
 

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Oil change planned for this week and just want to confirm a couple of things.

Is it defo 3 litres the box takes as I have seen 1.87 litres mentioned aswell.

Also what size hex are the drain and fill plugs seen 10mm and 12mm mentioned but want to be sure before I have it jacked up with tray off as don’t have a 12mm.
 

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1.87 litres is correct, but an overfill is recommended. I used 2.2 litres.

Both plugs are a 12mm hex, you will need a couple of long extensions to get to the top one, and a funnel with a tube attached to get the oil in.
 

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Hi All,

I have not had any Luck any other places, so i will try here.

I have an Alfa Romeo 159 with the 2.0 Jtdm engine. My gearbox (C635) is feeling a bit tired in the lower gears (1st, 2nd, 3rd). I think that I might go down the road of changing the gearbox. I have looked around for gearboxes and found that Alfa uses the C635 gearbox on many giulietta’s but they all vary in the final drive and some of the gears (i think this is true, please correct me if im wrong) the direct swap is from the 2.0 Jtdm-2 but they are hard to find with a low milage. Therefore i have found that the 1.6 Jtdm is relativly close to the gearing on the 2.0 gearbox. The gearing is a bit higher, but not by much. Below is the gearing information I have found:

2.0 Jdtm & Jdtm-2:

1st: 3.909
2nd: 2.118
3rd: 1.361
4th: 0.978
5th: 0.756
6th: 0.622

F/D: 3.579

1.6 Jtdm:

1st: 4.154
2nd: 2.118
3rd: 1.361
4th: 0.978
5th: 0.756
6th: 0.622

F/D: 3.421

Does anyone think this will hurt the drivability of the 159? (Its a Sportswagon - Thus a heavier car than the giulietta)

I’m looking forward to your answers.

Regards,

Thomas
 

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Hi Thomas, If the gearing is shorter it might help the acceleration but make the car rev higher at cruising speeds.

Have you thought about getting your existing gearbox rebuilt?

Might be a cheaper and easier option.

Where are you located?
 

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Hi Symon,

Thank you for your response.

I'm located in Denmark, and i must admit that i have not checked the prices of a rebuild, because i thought this would be the most expensive option. I will give that a go.

In regards to the 1.6 Jtdm gearbox, it is higher geared. This worries me that the 159 will feel very sluggish, as it will take longer to come into the power-band of the engine.

The biggest problem i have with the gearbox is 3rd gear. Some gearshifts into 3rd, is almost like you have to go over a notch, before it goes into gear - making it a very long gearshift, and thus boost pressure falls, meaning killing fun. But sometimes gearshifts into 3rd are just fine.

Besides this 1st & 2nd are a bit clunky, but i don't know if this is just a "feature" of this gearbox. 4th, 5th & 6th are just fine.

I might also add that i have changed the oil to the recommended Fuchs oil from Autolusso. When the gearbox is warm (I.e after a long motorway drive) it the clunkyness & 3rd gear problem is less noticeable.

Best regards,

Thomas
 
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