I have a problem with excessive oil pressure, it's an M30 engine

Thanks a lot for your response, so I should dissassemble the whole thing ? or as an example, remove the oil pan, check the pump releif valve, and remove the head and maybe blow some compressed air to check for obstructions, or it means dissassemble the whole thing and check part by part ? I really would like someone with more experince to teel me I don´t have to do everyhting over again. Honsetly, thanks a ot for the reply.

Thanks will check, but the head was completely refurbished with the camshaft, also in doubt of the thickness of the duck gasket, does anyone have a thickness for it ?