how much will cost fix a vanos oil leak?

Hello, Repairing any oil leak will require that the technician finds the source. Once identified and proven, the quote will involve removal, cleaning, and replacement of the seal, gasket, or silicone, plus there may need to be an oil change. This depends on the location of the leak. It is best to have a visual inspection completed in order to obtain an accurate quote, and I recommend shopping around for someone with experience on modern BMW.