D16Z6 Oil Leak; Help??

Hello everyone!
Ok, i need help from somebody, inside my car theres a D16Z6 stock. Since I brought the car I notice a small leak of oil coming from the valve cover, so recently I change the Valve cover gasket, It still leaked. I change the Distributor gasket... Still leak
What It could be?? we checked the valve cover gasket and put silicone around the corners and everything but I still dont understand where the leak its coming from! 
Ok, i need help from somebody, inside my car theres a D16Z6 stock. Since I brought the car I notice a small leak of oil coming from the valve cover, so recently I change the Valve cover gasket, It still leaked. I change the Distributor gasket... Still leak

