Hi fellas, I am looking at switching to premix for my race bike.

I have almost 4 litres of Castrol TTS sitting here that I have been using for the injector system, how good is this stuff for premix race application (compared to something like Motul 800)?

I'm a bit loath to simply put it on the shelf and not use it. It's opened so not much resale value. But if it is still pretty damn good then I will use it up. What do you think?

Cheers for the assistance guys.