Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

So, I recently purchased my first Porsche ... a 1999 911 Carrera 4 coupe. I had previously driven my uncles '03 turbo and decided I wanted one. My plan is to use it as a daily driver as much as possible here in the northeast so it will replace my '91 BMW 850i which I've had for the last 6 years and 45k miles.

The 996 is a 6-speed with 94k miles in silver with blue interior. It drives extremely well and was a bargain in my book at $15k.

It will join the other cars in my garage which include: '91 Dinan 8 (twin turbo v12), '88 Corvette coupe (406cid v8), '90 B2K Callaway Aerobody (twin turbo v8), and the '90 Corvette vert (supercharged 396cid v8 / NOS / cage / etc).

I have a lift and workshop so I try to do all of the work on the cars myself and the Porsche will be no exception.

So... I have my first issue which needs attention and I was looking for a little guidance from the experienced owners here. I took it out yesterday and drove it fairly hard... nothing stupid, but harder then I would drive it normally. Anyway, I smelled some oil burning which of course scared me a bit.

It turns out that there was an oil leak that was dripping on the drivers side header. Up on the lift, I was able to see where the oil was coming from. After some research (https://sites.google.com/site/mikefo...torreplacement) it appears that the oil is coming from the AOS bellows. I was thinking about just replacing the bellows and using newer style screw type clamps.

Why not replace the entire AOS? Well, the previous owner had it done a few years ago. Secondly, the link states that its probably functioning correctly if I could pull the oil cap off easily with the engine running... which I was able to do.

So, does anyone have any recommendations?



Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

JRW...I am dealing with the same issue now. On my 03 Carrera Cab (50k miles) I have an oil leak from the crankcase breather line. From what I have read here and on other blogs, replacing the AOS seems to be a popular move. Unlike you, I do not have the skills to do this myself, but I will let you know what I found out from my shop. Good luck!

Link to post
Share on other sites
  • 1 month later...


You may want to see if the leak is coming from the spark plug tubes. This is a common issue with the early 99 3,4's. Oil can seep from the tube and land on the headers. It's an easy and inexpensive DIY to replace them. Also check and see if the cam covers may be leaking.. This is also common. To remove and re- seal the cam covers requires a special Porsche tool holds the cams in place. What was recommended to me was to take out the bolts and put sealer on them and re install them. You do this one-by-one without ever removing the cover. Therefore no tool needed. Sometimes just doing the bolts will do the trick. I did this on my 99 996 that had a leak just like you are describing. I did the tubes and re-sealed the bolts and no more leaks! Just a suggestion if the AOS passes the test. You have quite a car collection there! Congrats on adding the 996 to it! :thumbup:

Edited by Loren
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.