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No words of wisdom from anyone yet, so I'll have a shot at it.
First off, if you didn't have a oil pressure gauge, but just a light, like the majority of car owners, you wouldn't be aware that anything had changed.
And as you know, high oil pressure is not normally considered a problem, compared to low pressure.
The easiest explanation would be that the pressure relief valve is somehow not opening up properly - possibly as a result of the oil change, but I don't see why.
Less likely, the sender unit has gone on the blink. If it is located close to the filter, as with some engines, you could have accidentally bumped it.
But I would then expect the gauge to show no reading at all.
Maybe a bit more likely is that the gauge itself has lost its calibration, with the oil change being purely coincidental.
They are damped, like temp. gauges, so that owners don't fret over inconsequential variations.
If the h/w or s/w that does that goes wrong, I suppose it could start reading too high across the board.
Lastly, with the oil, it may be possible that a different brand of oil of the correct viscosity range could be heavier than your usual one.
But I think that varaition applies only to full synthetics, and it wouldn't be that big.
Can't see that the filter could cause the symptom, even if a bypass valve was missing or not working properly.
But to rule that out it, would be easy enough to try another filter without too much work or expense.
Personally, I would just monitor things and see if it corrects itself, or wait for someone to suggest something definite from their own experience.
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