Leaking from radiator cap, why?

had a radiator cap leak causing coolant to spill. Even with a new cap, it leaks. When I turn off the Jeep while it is hot, oil occasionally seeps out of the cap really badly. What is happening?

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Hi, Leaking from the radiator cap could be due to several reasons: worn-out cap seal, excessive pressure in the cooling system, or a faulty radiator cap itself.

A leaking radiator cap is typically caused by normal wear and tear. However, it’s sometimes caused by a damaged radiator hose that causes a vacuum effect. Don’t drive with a leaking radiator cap, even when your vehicle still runs.

I believe that the plastic piece where the cap goes into may be experiencing some issues. I feel like I can be easily replaced. And don’t forget about the cap.