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Technical Ducato year 2001 2.8JTD, which gearbox oil?

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Technical Ducato year 2001 2.8JTD, which gearbox oil?

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BGD

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Ducato year 2001 2.8JTD, which gearbox oil?

Original Fiat Spec was apparently to add 2 litres (later amended to 2.7 litres to better protect 5th gear cog) of: synthetic 75w85 GL4.

But I've seen elsewhere on line suggestions to use synthetic 75w90 GL5


Am finding it almost impossible to locate any 75w85 GL4, so am tempted to use the 75w90 GL5.............thoughts please from anyone with a specialist knowledge of gearbox oils?

Thanks in advance.
 
BGD said:
Ducato year 2001 2.8JTD, which gearbox oil?

Original Fiat Spec was apparently to add 2 litres (later amended to 2.7 litres to better protect 5th gear cog) of: synthetic 75w85 GL4.

But I've seen elsewhere on line suggestions to use synthetic 75w90 GL5


Am finding it almost impossible to locate any 75w85 GL4, so am tempted to use the 75w90 GL5.............thoughts please from anyone with a specialist knowledge of gearbox oils?

Thanks in advance.
Click to expand...

Early gearboxes has bronze syncros that the GL5 additive damaged. Not sure which syncros yours has. You should be able to get a 75w85 gl4+ oil which is bronze safe but has highpressure properties like gl5 at a renault dealer its used in the laguna.
 
I guess the other, and certainly easier and cheaper option, is just to use bog standard synthetic 75W80 GL4, which every garage and accessory shop has by the bucketload, and which two shops now have told me is the correct grade for my Ducato having looked it up on their databases (despite my manual saying it should be 75W85 GL4 synthetic)

75W80 GL4 synthetic oil must surely be more or less exactly the same as 75W85 GL4 synthetic?
 
In a box known for problematic syncros I would go for a 4+ for a few extra quid.
 
So, just so I understand.......... I think you're saying that it's the "+" bit added on to the GL4 spec that makes it bronze-safe.

Thus any make of GL4+ 75W85 synthetic oil will be "bronze safe"?
 
BGD said:
So, just so I understand.......... I think you're saying that it's the "+" bit added on to the GL4 spec that makes it bronze-safe.

Thus any make of GL4+ 75W85 synthetic oil will be "bronze safe"?
Click to expand...

The + bit means it has more high pressure additives than normal gl4 but is compatible with gl4 spec. Other oil suppliers list it as gl4/gl5, universal etc. You can always contact the supplier for a recommendation. For exmple I emailed granville oil about a transfer box lately and the replied within a couple of minutes with a full test report.
 
Sorry, now I'm even more confused!

So what exact spec gearbox oil should I actually be going for?

75w80, or 75w85?
Gl4 or GL4+ or GL4/5?
With EP additives or without?

It's the eating-bronze synchro nightmare that I really want to avoid!
 
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