There are some engines in developed countries which can be used for 0.2-0.4 million km without changing lubrication oil with pregreased, sealed bearings that have lubrication enough for the designed lives
Pali mitundu ina ya engine kumayiko otukuka yomwe ingagiritsidwe ntchito kwa 200,000-400,000kms popanda kusintha mafuta ofewetsera zitsulo chifukwa ma bearing  ayikidwa kale mafutawo komanso ndiwokutidwa ndipo ali ndi mafuta okwanira nthawi yonse imene angagwilire ntchito