Just bought a G plate Seriries two and after changing Oil and filter when the car idles the oil pressure light flickeres on and off and if left at idle for 30 seconds or so it comes on permanently and the engine sounds a bit tappetty as soon as you blip the accelerator it goes out but comes back on as soon as it returns to idle.
it had a split breather filter but this was replaced when the oil was changed there are no other obvious leaks and i used 10w 40 magnatec oil.
Any ideas

Cheers