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What gearbox/ diff oil for Mk.3 GT6?


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I can never get the searches to find anything useful on any forum... :-/  
As a total newbie to classic ownership I am gathering as much info as I can get to prepare me for the work ahead! I am wondering what gearbox oil/ diff oil do you use?
The manual says EP90 oil for both (as well as the lower steering swivel) but any of the motorfactors around only have 75w90, etc.
So what do you recommend/ use?


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Here's an excellent article with plenty of info on this topic from the Quantum Mechanics website......they specialize in British Gearboxes (transmissions).
I have no connection to them but I did find this article well worth reading.


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