The oil the we reccomend and use in the 4rt, of all models.
A friend of ours that builds race engines, told us in his experience Castrol is the best oil for Hondas of all variants.
 
Castrol POWER1 Racing 4T 10W-40 is a fully synthetic 4-stroke engine oil for modern, high performance bikes that increases engine acceleration and power right up to maximum rpm.
Castrol POWER1 Racing 4T 10W-40, using Race Derived Technology based on Castrol's long and successful racing association, flows fast and stays strong, reducing internal engine friction even under the most arduous riding conditions. Castrol POWER1 Racing 4T is specifically designed for bikers who love the exhilaration of riding on the limit. It has been tested and proven to deliver exceptional acceleration and power at the twist of the throttle.
The added Castrol advantage of Trizone Technology ensures uncompromised performance protection.
Castrol POWER1 Racing 4T - ultimate performance for extreme riding.