Ibiza 6L Facelift 1.4 75 HP -> clacking or knocking ?

Hello people, I drive a Seat Ibiza 6L BJ. 2006 with the 1.-4 75hp engine… The vehicle has only 82,000 KM down and there is already something clacking in the engine room. This noise only occurs when idle or accelerating.. not if you have the gear in it and let yourself roll. When the engine is cold you hear the clacking more clearly.. as soon as the engine is warm you have to listen a little more because it becomes quieter… the clacking will be faster with the speed! So now to my question… What should ic h do it now? Should I go to Seat and have the car checked? I didn’t have to deport in front of the car now… What could that be? By the way, the car is fully stocked at Seat and only 5W30 oil came in! Today I wanted to try 10w40 from Liqui Moly… What do you think?