I have had a small amount of coolant (6 - 8 oz) added 3 times during the last year. The BMW service reps had told me that this was normal. Today my low coolant light came on and I took it by the dealer again since the car is still in warranty. This time they pressure checked the system and found a small leak in the radiator which had to be replaced. This surprises me after only 38,000 miles. Fortunately, it was replaced under warranty. BMW must be using some pretty cheap radiators.
