Yes we need to fully drain and refill.. Any oil whether regular mineral oil or semi/fully synthetic, turns black once it is used up completely and we will have to drain it.. And complete 1 litre engine oil should come out while draining.. Else it means engine oil is leaking either from the nut below or from cylinder head..
You will start noticing vibrations once there oil is used up.. Best thing is to keep checking the color of the oil once it is near it's limit.. For ex : in case of shell ultra, check at 4k km , 4.5k km, 5k km and every 200km after that.. When you find it's almost black , you can change it..





Comment