recently refurbished gear box advice.
 

Hi guys.
I have bought a 5 speed gear box which was refurbished by Api 6 k miles ago. Im thinking of turning my scoob into a dedicated track car. Just wondering what the situation with how often oil changes with a newly refurbished box should be and what oils people recommended for box and diff for track use. Which weight and brands please? Im running 330bhp and 300 torque in a bugeye. I know this is not an ideal amount of power to run through a 5 speed on a track but im thinking that the box is fresh so should hopefully handle it if treated with respect.
Many thanks.