I have an Omega Caravan 2.0 16V Built 95. The engine clacks when it is cold like a diesel, but only the first 2 to 3 kilometers, then the noise disappears, and the engine runs quite normal! The previous owner has said, it would have always been like this, and I should not worry about it, but somehow that can not be normal, right???Has someone villeicht an idea what that could be??? Thank you Frank