Castrol Power 1 4T 15W-50 is an advanced technology, high quality oil designed for the latest generation 4-stroke motorcycle engines. The Castrol Power 1 4T series with Power Protection Formula was designed specifically for riders who enjoy the thrill of riding. The Power Protection Formula was specially developed to protect the engine from the build-up of deposits that reduce its power. It has been evaluated under extremely harsh engine operating conditions in a specially designed mechanical test and has proven to achieve superior engine deposit control, ensuring power protection throughout the life of the oil.