Hi All! I have a problem with my W124 with OM602 engine. It takes about 8 seconds from the start to build up the oil pressure. Once the oil pressure is there the engine runs fine and keeps the pressure without any problems. I've suspected a non return valve in the filter housing was the problem. I've replaced the valve for new one ( I was lucky to find NOS, they are not available from the dealer anymore) and also new spring has been put. Unfortunately the problem is still there. No improvement. I don't know where to look now. Apparently there is another valve in the block which hold the pressure in the lubrication system. Can anyone help with this matter. Thanks a lot. Link with the video showing the problem below: