Hello dear screwdriver. Today I installed my new general overhauled cylinder head that I had purchased for 400 euros. At my golf tdi the tooth strap is torn. There are 2 valves bent therefore the new head. Case had nothing off. After the installation of the acquired head I started the engine. It ran perfectly. After a few minutes running I determined that the new head is leaking. Delayed. See photo. Do you know what the sealing can do? Oil comes out at the return. I thought of atmosit housing seal…. I was curious about your answers and assistance. I could of course dismantle the head again but what is associated with a lot of work.