My wifes 2008 128i cabriolet has 12K miles on it. I heard the ticking sound before but after a few minutes and you rev the engine it would go away. Today was different I let it idle for about 5 mins. revved the engine and you could still hear them ticking and when it goes back to idle ticking is still there. I copied the ist page of this thread ans sent an email to the dealer to see what they have to say. I am keeping my fingers crossed.
70 Morris Cooper S * 08 BMW 135i Coupe * 08 BMW 128i Convertible * 03 BMW 525i Touring