I have a 2008 Chrysler 300 LX 2.7. And my oil pressure light keeps coming on after I’m braking/stopped. I changed the oil and oil filter and changed the oil pressure switch and the light still keeps coming on. And while driving the oil pressure light stays off.
The next step would be to have the oil pressure checked. Your engine requires 10 psi of oil pressure per 1,000 rpm. So you need 30 psi at 3,000 rpm and 6 psi at 600 rpm. and so on.
An actual gauge will be able to show you if everything is alright.