Both my '03 and '04 disco's have now developed an oil leak at the base of the stand off tube at the interface with the valve cover. Question: what kind of oil seal is there and how do I change it? Have already changed the cap gasket and 0-ring.

I have looked down the tube and it seams to have some sort of snap or bayonet mount??

Thanks

 

Have you searched Atlantic British for the part? They also have lots of tech tips on their site.