There's another reason for draining hot. Apart from the fact that hot oil
runs faster than cold oil, having hot oil in the sump menas you can do
something else. Run a magnet along the outside of the sump finishing your
'stripes' alongside the drain plug. If you do this as you would when mowing
a lawn, any metal particles will more reasonably run out when the plug is
removed. You could of course go the 'non-original' route and fit a magnetic
sump plug. This will attract all manner of crud while you're using the car
and it may frighten you to see how much crud is floating around in the oil
anyway.
Jonmac
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