Certainly not wanting to start an argument over oil types and grades.
A basic summary of my findings after changing the gearbox oil to V Twin.
The standard oil for these bikes is a 85/90 GL5. After reading other posts on Guzzi forums, it seems that The Redline oil is the preferred choice by many. A quick email to Redline confirmed that it is their recommended gear oil for the 8v 1200 and was also suitable for the final bevel drive.
If the container has been sat for a few weeks it needs a good shake.
Deep red colour very thick - website mentions liquid grease - probably the best way to describe this fluid.
On the road:
When cold - it slips into 1st like flicking a light switch. To the point where I had an element of doubt if the gear had been selected. For the first 5 - 10 minutes the shifts feel very ‘dampened’ and a little characterless. Neutral was slightly harder to select until I recalibrated the force applied my left foot.
Slight reversal when up to temperature. More of a clunk going into 1st when stationary but almost acceptable when moving.
Would I use V Twin again? Probably not.
Will it get changed out for regular 85/90 GL5 before the next scheduled service? Probably.
Interested to read what others using this oil have found.