Gurgling, Bubbling from engine when turned off after "idle"

So, this is new... never heard this before (did a recent oil change though)

So if i turn on the engine and let it heat up and idle for 20 minutes? then the second i turn it off i can only hear what i describe a Gurgling, Bubbling sound within the engine (could it be the oil?) boiling ? lol

Cooling is ok fan turns on new antifreeze etc engine is fine on that part.

The oil is Castrol gtx 15w40

3 Litres have bene poured in.

Any idea?
 
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