I had the rocker cover gaskets replaced when I had some rockers replaced. The new Mahle rubber gasket has leaked oil on top the left hand side of the inlet manifold.
The garage have said their supplier told them as the covers are Mickey Thompson aluminum covers on standard heads, it needs a cork gasket not a rubber one. I find this strange as I had no problems with the previous rubber gasket (of unknown make). Any suggestions would be apreciated.