I use this....

https://www.morrislubricants.co.uk/products/auto/gear-transmission-oils/lodexol-xfs-80w-140.html

It has LSD friction modifier already added, although sometimes a bit more is needed if you can hear the chatter.



DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4