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DIY: Do It Yourself
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Old 06-29-2009, 09:03 PM   #1
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Join Date: May 2007
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My Ride: 330ci
mini-DIY Dip stick guide o-ring replacement

Back story to this DIY is that I replaced the CRANKCASE-VENTILATION/OIL SEPARATOR but in the process incorrectly replaced this O-ring, which lead to further oil leaks from where the dipstick guide enters the oil pan. It took me a while to figure it out that I screwed up the o-ring replacement at that time. When I recently removed the dipstick guide no o-ring was there. Ugh... Its been leaking oil at that spot for the past 40,000 miles. My mistake the first time around was that I seated the o-ring into the oil pan hole, then pushed the dipstick guide in, which always chops that o-ring.

Use the following mini-DIY at your own risk.

This is a guide to replace just the o-ring on the end of the dip stick guide that goes into the oil pan.

Buy a couple of the o-rings. They are easy to tear and cheap.

Part for 330ci:

Parts referenced in DIY:

1. Dip stick guide is Number 9 :

Follow other DIY's to get to the dip stick guide.

Before removing the dipstick guide clean around the hole and dip stick. After removing the dipstick guide, clean around the hole and dip stick guide.

1. Remove old o-ring. Look on the dip stick guide and oil pan hole.

*Reminder to clean oil pan hole and dip stick guide.

2. Use Vaseline and lube the new o-ring and dip stick guide
3. Put o-ring on to the dip stick guide up to the built in bump stop.
4. Insert the dip stick guide carefully back into the engine. When you are near the bump stop you will feel some minor resistance, then you will feel the o-ring slip/pop in.
5. As best as you can, look around the dipstick guide and hole, to see that it is seated properly.

Please post any suggestions or corrections
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Old 12-21-2010, 11:07 AM   #2
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Join Date: Jun 2005
Location: Alabama
Posts: 296
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I just did the CCV replacement, and when I checked the dipstick guide AND the entry point on the oil pan, I didn't find an o-ring. I've been having huge leaks and now I wonder where the o-ring went. In the pan? Who knows. Hopefully this will at least fix the oil leaks.
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Old 03-26-2011, 11:26 PM   #3
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Join Date: Nov 2010
Location: Buckeye,AZ
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My Ride: 2001 330i
I am in the middle of the oil separator job right now. Thanks for your input here. I want to make sure I get that dipstick back in properly.
As a sidenote, my 330i is going to be sitting in the garage for another week because I didn't order genuine BMW parts. I ordered after-market oil separator and hoses. The separator won't connect to one of the hoses, so now I have to wait for new parts to get shipped to me. It sucks. I really wanted to finish everything this weekend.
I just wanted to vent.
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Old 01-25-2013, 10:18 PM   #4
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Does this cause lean misfire codes or engine hesitation with it not seated properly? Anyone notice improvement in performance after correctly installing the o-ring (apart from no more oil leaks there) ? I suspect i've installed mine incorrectly as well.
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Old 12-11-2013, 11:31 AM   #5
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Originally Posted by Landlorder View Post
Does this cause lean misfire codes or engine hesitation with it not seated properly? Anyone notice improvement in performance after correctly installing the o-ring (apart from no more oil leaks there) ? I suspect i've installed mine incorrectly as well.
I know this is old post, but if someone is searching I would like to give my input. I don't think the oil dip stick o-ring can produce misfire codes (p0301-06), but p0171 and p0174 are likely if it doesn't fit well. You should be getting both p0171 and p0174 not just one. If you have one (p0171 OR p0174) its likely that you need an oxygen sensor for bank 1 or bank 2!
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Old 12-11-2013, 01:07 PM   #6
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When I did CCV on my old 330i, dipstick tube with new o-ring just wouldn't go back in. Since I was doing work in the middle of cold February in unheated garage, I got frustrated and towed the car to to shop up the street. They had to use rubber mallet to drive the tube in. Just an FYI


Originally Posted by roronoah View Post
so 2004 bmw's dont come with a diff?
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