Too many variables to pen a good comment that applies to all circumtances...
of course the orientation of the filter counts for some.... the presence or
lack of an anti-drain-back valve (not to mention the possibility that
something may be trapped in this valve if it is present). IMHO, it isn't
something one would be concerned about..
If the filter is mounted vertical and you brought it straight down and
checked it, it shoud be nearly full to the top.
My guess is your filter is on an angle and perhaps some drained out as
you dumped it. It that case you would see very little running oil. The
filter would be heavy though because most of the oil is trapped within
the element and would not immediately drain out even if you turned it
upside down. A new filter is very light. You could compare the weight
of a new and used filter to compute the amount of oil in the old one.
It's a good thing you are watching closely on a newly purchased
vehicle. I really doubt that you have a problem though.
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