There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Provided you are talking about the MIL Light = Malfunction Indicator Lamp? the 97 Mark VIII is an OBDII computer system. it requires a scan tool to reset / turn off the MIL / check engine light. it requires repairing the fault / problem to keep it off. drl
Check Crank sensor located in the block near the ac compressor
Passenger side under the engine.
If I remember correctly, back where the engine connects to the transmission
Facing the engine, low left side of the engine .
Passenger side of the engine.
Between the intake and the engine block
check the brakelight fuse.
check your ride height sensor
chain a cherry picker to the fuel injectors and jack it up, engine SHOULD just pull out. (who asks this sort of question, if you are asking this here you should not be working on a mark viii.)
According to the ( 1998 ) Lincoln Mark VIII Owner Guide : With engine oil filter change : The 4.6L V8 engine takes ( 6.0 U.S. quarts of 5W-30 )