Hi there,
I used Castrol TTS (fully synthetic) on my TZM before but since my
riding style is rather sedate, it resulted in a lot of oily residue
at my exhaust pipe. I gathered that it is only worth to use if you
are always riding at higher RPMs, say 8000 and above. Also, there
is a lot of white smoke at start ups.
I am now using Yamalube 2S which is semi-synthetic and I am pretty
happy with it. Doesn't seem to have any detrimental effects nor did
I notice much performance difference between it and the TTS.
As for gearbox oil, I am using Shell 4T as it is the recommended
oil to use by Yamaha Japan for Yamaha bikes.