Help! Oil Pressure Sensor & won't start!

[White535Mtl]

Hello everyone~
Well that's the major problem which I wanted to consult you guys about.
The engine cranks just fine but it won't start. Sometimes, it'll start after cranking the car five times. Sometimes it'll just start.
I get Oil Press Sensor in the display. Can anyone help me?

[632 Regal]

sounds like the check valve in your filter canister is shot...someone probably has one here

[White535Mtl]

Had to crank her 5 times tonight before she started...
Anyone?
Filter Canister?

When I run the car and stop, after a few minutes, it'll start no problem.
It only does that if I leave it for an extended amount of time like 2hrs +