Bought an m5 f10 today and pretty much out of the 5 cars I saw, all of them had the milkey bit in filler cap which normally indicates blown gasket.
i checked the water reservoir and no issues there and the mechanic told me it is condensation.
upon further research, it appears to be either condensation or blocked ccv . what is you experience?
the car only has 15k on the clock
some were much worth that other but they said it is because they have sat in cold for long
If they were driven short distances and never fully warmed to burn off the condensation that's is produced in a cold engine start up then it could have milke shake in the oil filler cap