|
If it makes you feel any better, my 128i with approximately 160K on it had similar staining when I was doing my intake manifold upgrade last fall....and that's on a non-boosted engine, that runs great with good compression/power etc. It was maybe a bit less than yours, but yours is a boosted engine so I can see that small amount of seepage being higher. I'll let an actual mechanic reply but IMHO I don't think this is a big problem if your leakdown test comes back clean...
|