Originally Posted by Werewolf

I am not sure I agree with you. I have not seen a newer BMW with over 200k miles let alone 600K. The closest I've seen is a e24 with 215k miles; a much simpler engine design than a double-Vanos I-6 3.0i.

Modern (2000+) BMW engines are
1) high-compression, high-revving and are more 'sensitive'
2) have more gadgets and sensors than older engines
3) sometimes have coolant-related issues (warped heads, etc)

I don't think the engine would make 600k or even 300k without a major rebuild. But I don't know if we will see one. Why? b/c the rest of the car will break down 1st / repair costs will be too much and the owner will scrap the car before the engine rebuild.

Let's wait and see