There's air in there and if it's been sat for a while with temperature fluctuations , condensation occurs . I always feel it benefits from a bit of a warm up .
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I have found that replacing the drain plug before refilling with £35 worth of oil is a good idea.
I buy oil in bulk (20lt. drums) from Opie Oils - their sales guy posts on a number of forums (including SWB) as “Oilman” to advise of any special offers they have and as stated previously I do the same and decant into 5lt containers to administer it. An old empty 20lt drum is useful for collecting old oil and periodically taking it to the tip for recycling.
Mention SWB to get a discount. He can be pricey though. Will give advice willingly and knowledgeably.
Only thing that I've bought from there was 3 plugs.