It sounds from the spec you posted Ellie that a synthetic GL4 75W gear oil will do the job nicely.
I believe the 850, although FWD used the same oil as the M90 so the website is right if you look at it as M90 and 850 - they may have economised with words.
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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