[JoeyBimX5din]

Originally Posted by -c-

Shouldn't matter where you bought it !

If BMW is doing the work they should give you a loaner! At least that's what every BMW dealer I've ever come across has done.

Anyhow, I'd still think it's possible it could be a rod knock but interested to hear what they come up with. Another thing is they probably know what it is but use this as a tactic to bleed all the money possible out of the fix! Sorry I'm just a sceptic and been kind of ruined because My dealer I used to work for did this tactic for a while till shit rained down on them and they quickly removed a select amount of individuals for making that a common practice. Thought it was funny they never knew anything ! Mechanics are trained professionals that should know their way around any car. But alas I'm just being negative.... sorry.

I am not saying its impossible, but I personally have never had a rod knock that bad without any sort of oil usage or output of the tailpipe. With the extra play the cylinder just doesn't seal. I think that noise is in the cam/timing valve-train. It may be possible to have a rod knock with no oil smoke or usage, but I feel like its highly unlikely.