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Old 06-08-2012, 06:37 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
Join Date: Apr 2007
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Mein Auto: '02 530i Sport auto
Originally Posted by bluebee View Post

Does this diagram get closer to representing the old and new dipstick guide tube construction?

Is the entire "tank" below the o-ring seating spot just a big oil tank? If so, the holes shouldn't matter, right?

Why did BMW design the concentricity in the first place then?

I believe your diagram is correct. If you look at the Real.OEM diagram, yes, the "tank" (oil sump) is just a container for the oil. And yes, the holes should not really matter. I believe a more effective solution would be to cut the outer section of piping (the portion that johnstern drilled into) below the connection interface to the oil sump. That would eliminate the risk of drilling debris from clogging the pathway. It would also increase the "area" for the CCV drainage to flow through, below the connection interface. However, it would not correct the limited flow through cross sectional area that still exists
at the connection interface. Hence, the improved dipstick tube is the best solution, especially for those in cold weather areas that drive short distances on cold engines.

For the $130 price, it is well worth NOT having to redo a CCV replacement ( a HUGE PITA). I did mine 2.5 years ago and may need to redo this again. This time I will buy the new dipstick.
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