I have read and found out that both oils are suitable for our gearbox,

and the 50:50 mixture of both oil is also good.

I live in New Zealand and the weather never gets so cold here.

Which would be most suitable gear oil to use?

MT90 vs MT90+MTL ???

 

I tryed the MT-90 and did not like it at all I had it out in under 500 miles. My trans bumped and every gear was hard to shift into.

I use the New Honda fluid and it works very well very smooth

 

I used MT-90 and worked well when warmed up. But too stiff otherwise. MTL would be better for a redline product. Most S2ki'ers hear, use the GMSMFM lube. And the "new" style honda lube is getting good reports also.