I got that from your original statement.
What you have to do is have the actual oil pressure tested with a gauge.
14psi is the idle pressure. Anything less should be kicking the light on. If there is less then that though, it indicates the oil pump is failing.
I do see you changed the oil which is a good start, if you didn't then you should also change the filter. But, it sounds like the oil pump could be going out on it. You should really have the pressure tested to know where you stand with this. If you want to test it yourself, then the gauge screws in where the oil sending unit is. Then you pretty much just fire it up and let it idle.
Sometimes using a slightly heavier oil will help this as well. Like maybe using 10-30 instead of 5-30. Just to get a little more time out of it before you have to replace the oil pump.
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Thank you so much!