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Old 01-07-2011, 08:54 AM
heyjerky heyjerky is offline
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Dipstick O-Ring question

Doing my CCV swap I decided to replace the dipstick O-ring. Should it put the O-ring onto the tube of the dipstick and then insert into the engine, or should I put the O-ring into the hole in the engine and then insert the dipstick?

When I put it back together I just slid the O-ring onto the dipstick tube and put it all back together, however looking with a flashlight I can see the O-ring sitting right on top of the hole, when I removed the original it was down in the hole, so I'm doubting it will seal right.

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Old 01-07-2011, 09:21 AM
KeithS KeithS is offline
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Mein Auto: '11 335d, '17 340iGT
Been there done that. It is a little tricky. The O-ring needs to be pushed into the bore. If it's sitting on top, you will leak oil. What I did was to first clean the bore/hole very well and made it as smooth as possible. Put the O-ring on the dipstick tube first up to the lip. Then, even though this is all surrounded by oil, lube it real well. I used an actual rubber lubricant but you can use something like petrolium jelly. Then just push down hard on the dipstick tube, wiggling and twisting while pushing. I used the hose bracket on the tube for more leverage. You should be able to walk the o-ring down into the bore where it belongs. Remember the O-ring is sealig via the inner and outer edges, not the top and bottom.
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Old 10-19-2014, 02:39 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
> Complete list of all o-rings (by size & by part number) to buy when ordering parts
Originally Posted by bluebee View Post
For your basic oil change, here's a picture of the related o-rings that you can replace...

See also:
- How not to replace the dipstick guide tube lower large 0-ring (1)
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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