Oil is the engine blood. Truth! If we could change our blood once a year, I would live a lot more and healthier, but I can not. So we have kidneys, liver and bone marrow to keep our blood always level and clean. In case the engine is only the FIRST exchange with 1,000 km, the others can be made in the period indicated by the manual. If the use is intense, okay, you can anticipate about 500 km. But every 1,000 only generates waste oil and packaging in the environment. Then the bike pollutes more than cars.