Hi. I want to upgrade my fluids such as the gearbox oil and brake oil. I buy new braided brake lines from Goodridge. The break oil will be Motul RBF 660 but dont know how many i need to use can you tell me ? and the biggest problem ist the oil to gearbox. I want Motul 300 75w-90 racing oil but dont know if i can put it inside because normally it run 75w-80. So is the oil ok or i have to find another ? some, that works better than standard one in hot weather. and also dont know how many do i need to replace it. Thanks for help 
