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If this is engine oil all over the engine and you also heard this noise here this may indicate the PCV valve is stuck closed.This valve allows the crank case pressures to release into the intake.If this valve sticks closed the pressure builds up and can cause this noise as well as oil to blow over the engine where it can leak out possibly around the oil fill cap.The PCV valve should be located right next to the oil fill cap and will have a hose connected to it.I would replace this valve if it hasn't been replaced in the last year to see if it resolves this issue.Also check the hose that is attached to it to make sure the hose isn't damaged or restricted.
If all of these are o.k. or is not the case here let me know.