Hi Deller,
IT is 15/50 and it is proprietary! That means you can only get it from Triumph dealers. I had a local auto parts place call their mobil distributer on speaker phone and all they had to say was "Can we get 4T 15/50?" She immediatly responded "No that is proprietary to Triumph dealers only." So if you develope an oil leak and you use their $50 a gallon oil you only two choices.
1) Drain all the oil in your bike and replce it with something you actually have a half a chance of finding OR
2) Mix different oils.
This REALLY erks me as all it takes is for a sharp rock or other object to bump the oil filter and your out $70 and you haven't even damaged your bike!
:???:

:evil:
Preachp