Tech data here: http://www.opieoils.co.uk/lubricants.htmThe book recommendation is 10w-40 or 10w-50.
With the trackdays I would suggest a 10w-50 may be a better choice if temps are high.
Look at Silkolene PRO S 10w-50 or
Motul 300V 10w-40 Chrono
nothing wrong with it....book recommendation etcdhorwich said:whats wrong with 10w-50 this is actually what 'oilman' recommends ie silkolene pro S..!?