Hi. Can any one tell me how much gear oil is needed and what grade it should be for my 1990 freccia c12r. Also when i change from 2nd gear to 3rd sometimes there is nothing there. i have to gently tap the shifter back down and then i can get 3rd when i click up again. I think this is simply a case of an oil change but was wondering if anyone knows of any gearbox traights or if this is a comman fault.