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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

 
 
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Old 06-02-2012, 03:43 PM
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bluebee bluebee is online now
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 19,231
Mein Auto: 02 BMW 525i M54 automatic
How to test, clean, & redesign the original BMW dipstick guide tube (CCV vent clogs!)

Since I was replacing the holed boot to the ICV/TCV, I decided to check the oil dipstick guide tube and, much to my dismay, I found the concentric ring was clogged solid.

I checked the CCV thread which shows they redesigned it to eliminate the troublesome concentric tubes - but this thread is for those many of us with the original dipstick guide tube.

Since it's in my hands - and since I have ZERO experience with this problem ... I ask for all who are similar:
Q1. How do those with experience suggest we clean our dipstick guide tubes?

Q2. I lost the o-ring while blowing garden hose water on the dipstick; do you think the exact right size matters? BMW has the o-ring in stock ($3.83) but I'd have to button it up to get there. I can fit a garden hose washer on for now. Does it stand a chance of working?

Q3: How can we test whether our dipstick guide tubes are clogged or not - WITHOUT removing them from the vehicle like I did?

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Note: Your mission, should you decide to accept it, is to add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need, in seconds!

Last edited by bluebee; 06-19-2012 at 09:56 PM. Reason: Changed title. Title was: How can we clean out a clogged oil dipstick tube (connection to CCV)?
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