Gear box oil, higher tempreture ?

[r8byb]

Hey guys, my box has 75w 80 GL-4 Oil in, just topped it up as its lost 300ml in 5000miles and a few track days in between.

When it's cold and im changing from 2nd to 3rd for example above 6.9k its fine but apart a few times it will not go in as smoothly, is this due to the box oil getting hot ?

Can i change to a higher tempreture grade to stop this ?

Thanks Rob.

 

[bing_17]

6.9k when its cold... ouch!

edit: ops think i miss read that.

 

[r8byb]

No lol

When ive drove it for 20minutes normal, then take it to that sort of rpm i mean lol