hello, I drive the Passat 3BG Bj ́01 – 1,6l and I first describe my problem. I parked the car in the evening and in the morning came to check the cool water level stop. I looked and the whole balance tank was full of oil and in the motor was exactly the same light brown grütze. so first zkd exchanged and as far as possible the circuit was felt. rpump with built in. the problem that the upper hoses remain normally warm and the lower cooler hose becomes after eternal warm running in the stand only half-way warm but only very weak. (temper indicator stays in the car but at 90 grand and fan does not work on) have first thought in the motto continue to observe. have to clean several times balancing tank since there is always oil in it (I always thought that it was only the rest that were in the cooling system, since e only yesterday came the oil display that I should please tilt after and see there despite new zkd again on the oil intake cover and on the motor a really thick Helbraun slime and on the oil rod almost no more oil but also light brown slime. what can then please be defective? thank you already for your answers!!!