On 14/05/2018 15:51, Dave Plowman (News) wrote:
Here, seemed like a good idea, but in practice just as easy to change it
the old fashioned way. If you work out a handy way of something to drain
it into then transfer to a container for disposal.

If you suck the oil out from the top you risk leaving sludge in the bottom.

Drain from the bottom, and the sludge comes out first - and is washed
down by the rest of the oil.

Andy