Old engine (lots of sludge), give it a bit of a thrash down the motorway and
it pumps lots of oil into the head, pull off or just lift up and the sump
settles and the sensor detects low oil.
Put about half a litre in.
Maybe next time you service it ask about different oils and consider having
it flushed out (e.g. with "Gunk").
If you do DIY oil change with the ignition on, it will notice and remember
that there wasn't any!
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