PG1 box oil: MTF94 alternatives?

Hi,

I was thinking about doing the box oil. Haynes manual states MTF94, which can be found at Rimmers for around £10 per litre plus shipping.



I don't mind buying the recommended oil, but just curious whether there is anything superior nowadays, given that the oil was probably specced, what, 15 years ago now, or possibly more? Any thoughts?

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