Oil and check engine light comes on periodically when driving on 1990 Mercury Grand Marquis

Car has not been driven five minutes or more. Need to constantly place water in radiator. Check oil no oil needed. Notice some type of oil leak after car has been parked in a particular spot for over 10 mins.

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1 answer
your oil sensor is telling you of oil leak(reads pressure). take it to a mechanic for diagnostics.