Hello guys, I found out by chance that a black film floats in the cooling water balancer (or as the “ball” in the specialized Chinese is called) because I think I can spontaneously recognize it as oil. A quick search in this forum results in the frightening result: maybe only a small thing, but most likely cylinder head vision and in a bucket… Price from 400 euros upwards. D a I (as you have probably already noticed) am a pretty tech nive and not very much understand of cars, I would like to know why this part is so incredibly important, and why the part is also so expensive… after all you can find a original packed ZKD at Ebay already for about 30-40 Euronen… If you are a poor student dependent on the car and still have to turn every cent twice, you are interested in this already quite… Greeting CLix