Draining oil : hot, warm or cold

[Houtman_imp]

The reason for draining oil cold is that all the oil is in the sump and all the contaminants will be in that oil. If still hot some of the "baddies" will still be in the engine. I always drained it hot ( including burns ! ) but from now I will drain it cold to see if more old oil will drain out.

Draining oil when cold is counter-intuitive ( hot oil is more viscous and 'runny' ) but I could understand that, when cold, the oil will cling better to itself, with gravity pulling it out better as a whole.

Also, workshops are under time pressures and the bulk of the oil will drain quicker presumably, than waiting... and waiting... and waiting for cold oil

Some of the better shops put the bike in a cooler for a while to get the oil cold.....