hi everyone, 
just upgraded from a 2005 300 pro to a 2009 300 pro 
the 2009 300 pro cost me £1500  it needed bits and bobs such as new tyres and the stickers where taty, but for £1500 i am more then happy with it,  
went for a ride to day and found the clutch was slipping  i believe this is down to the gear box oil?  
when i bought it i tested the clutch and ran it through all the gears and it was fine, i did a oil change using 5w-30 as thats what i was told to use in my old bike and it worked great, but i think its making my new bikes clutch slip as when the bikes warm it slips much more then when i first stared it ( so oils cold ) 
if its not the oil what could it be ? 
also what oil would you guys use? 
any advise would be a great help 
thanks