Can't tell for certain.....but I think it is lower than the idle speed control valve.

Looks like the bottom drain tube from CCV to dipstick..Could also be dipstick o-rings, but this is less likely.

You probably have several leaks... find one, fix it, and move on to the next one.

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'03 530i - manual swapped - 425k miles
'06 325Cic auto 115k
'05 X5 3.0 auto 158k
'99 E39 528i 5-speed 130k