Which Gearbox Oil Type? - 2006 1.8 VVTi Manual

[Chris Howarth]

Hi, I'm trying to determine which type of gearbox oil to use in the manual gearbox of a T25 2006 1.8 VVTi.

According to the owner's manual the grade should be: 75W90 API GL4/GL5

But should this be semi-synthetic or fully synthetic? I can't find an answer anywhere, parts suppliers list both as being suitable.

Thanks

Chris

[mrfixer]

Either will be OK.  Be sure the oil specification specifically includes GL-4 (even if it states GL-5).

[TonyHSD]

Hi, 

I can recommend to you to get Castrol , been using it in the past in few manual cars and it was really good. This is the type for you: 

https://www.opieoils.co.uk/p-739-castrol-syntrans-multivehicle-75w-90-fully-synthetic-car-gearbox-oil.aspx

Regards 

[Chris Howarth]

Brilliant, thank you both for the advice, I really appreciate it.

 

Chris

[Uzmaan]

Hi,

Im in the process of changing my tranny oil this week.
My manual seems to mention to us 75w oil. 

I had a new (refurb) gearbox fitted in 2018. 
I have used 75w90, through the life of the gearbox. But it has developed crunching when downshifting to 2nd gear over the past 6 months. Upon googling and forum research, it has been mentioned to use LV 75w. After looking in my manual, it confirms exactly that. 

I wonder if the failure of my first gearbox was due to incorrect oil after a clutch change. The patterns seem to add up.