Assuming you see the level is more than the "Full" mark on the dip
stick, it's possible. Good reason why checking the dip stick once in a
while is smart preventative maintenance. If you've been doing that and
the engine is using as much as the dip stick would show, -3 litres, you
should hunt that problem down asap.
Year and odometer reading of your van?
> I have just got my van( nissan Primastar) back from a garage that said the
> oil level was low and they put in 3 litres of Oil! I didn't think it used
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>
> Could this be to overfilling with Oil?