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)
boeykew

Slight formation of mayonnaise in oil filler cap

Recommended Posts

Hi my wife bought last July a 2002 996 Carrera 4 with 96 000km. The full maintenance history being supplied with the (German import) car, and being a hobby mechanic, I did the maintenance incl changing spark pugs, oil (Mobil1), filters, etc... all according to the maintenace schedule provided on this site. By the way great site !

Now 7500km later, my wife tells me she got an oil level warning message. First time since 7 months I open the lid and pull out the oil dipstick. The oil level is just at the minimum mark. So I decide to top-up with some Mobil 1 and remove the oil filler cap. I was horrified to see some accumulation of crème beige thick deposit. :eek: Nothing massive, but on the inside of the cap and on the inside of the filler tube irregularly and at some places 1mm thick max. I checked again the colour of the oil with the dipstick and it is transclucent with the colour of (english beakfast )tea with no traces of intermix.

I checked the cooling water reservoir which is just above minimum level (but I do not recall at which level it stood 7 months ago) and the colour of the fluid is translucent and yellowish. No traces of mayonnaise anywhere here.

I topped up the cooling level and oil level... the engine starts well, does not smoke, runs smootly on all 6 cyl...

Could this formation of deposit in the oil filler cap be caused by the very low temperatures we experienced the last months in Belgium combined with the fact that my wife only travels 40km every day (20 in the morning and 20 in the evening) and therefore the engine nevers get hot enough to get rid of some 'natural" condensation in the crancase?? In this case this could be "normal" for a 996...

At the other hand, once the engine reaches operation temperature (which is at this season after +-10km) she got a firm foot and does not shy taking it in higher revs...

What shall I check next....coolant level and oil level (+ deposit evolution) I will certainly but shall I check the oil-cooler for faults?

Share this post


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

:welcome:

The yellowish looks stuff at the filler cap is normal for cars that are not brought to full operating temperature during drives. It is a mixture of oil and condensation from engine parts (cool -> heated).

If the oil loss was rapid then it would be wise to check for leaks as well as oil in coolant.

If both are fine then top it up (do NOT overfill) and keep an eye on it for a couple of weeks.

And to solve the yellowish stuff - get the car up to full temperature before shutting it down.

Share this post


Link to post
Share on other sites

I used to have a lot of creamy mayo looking stuff on the oil filler cap and I was told it was typical when the car is driven short distances and the engine doesn't have a chance to reach full operating temperature and have all the moisture burn off...

It freaked me out too -

But if you are driving the car to operating temperature regularly, then something else may be wrong.

BTW: oil consumption of 1quart of oil every two or three thousand miles is considered 'normal'...

Edited by roadsession

Share this post


Link to post
Share on other sites

Clean it off, take it for a good spirited drive or two or three and see if it's back.

Count me for another person that has experienced this, I used to have a 1 mile commute to work and back.

Then I stopped driving and got on the bike, no yellowish stuff forming on it.

Share this post


Link to post
Share on other sites

I'm breathing again ! :jump: I did review all the engine removal and dismantling manuals and read all te topics about "intermix" on this forum, and I was cold and warm at the same time ! Fortunately I'm missing most of the symptoms of a severe intermix problem.

Nevertheless, I will monoitor the evolution of any futher mayo in the oil filler cap and we will take in the coming weeks the car out for a couple of longer trips. Many thanks for those re-assuring words! I'm adding a picture I took when I removed the filler cap. Cleaned it up now! Rgds..

Share this post


Link to post
Share on other sites

That's a little more than what mine looked like, but not too different. It's probably not intermix, but just normal condensation. Once I cleaned it and stopped driving the car for a couple miles without ever getting to operating temp, it never came back. Now I only drive the car if I intend to warm it up to operating temp, even if it means going "the long route".

If you want to be certain it's not intermix, have a look at your coolant, what does it look like? If it looks mayonnaisey too, then there is a definately problem. With classic intermix, the oil will mix into the coolant system, but the coolant rarely mixes into the oil system.

Share this post


Link to post
Share on other sites

Mine looks pretty much like that on short journeys. We've had pretty low temperatures in the UK recently, too.

Share this post


Link to post
Share on other sites

This is not an uncommon occurance during winter months - I'm a big believer in taking the car (any car) for a good long run (say 50 km) at highway speeds every week or so. Even revving the engine to 5-6000 rpm occasionaly during a 20km urban drive does not generate much extra heat in the system - afterall, its only for a couple of seconds, then its back to the mundane 3,000 rpm chugalong for the rest of the journey.

Share this post


Link to post
Share on other sites

We drove the car longer and since then and about 1500km further down the road, there were no new signs of white/yellowish deposit anymore in the oil-filler pipe. I guess no-one needs to see a picture of that !

Many thanks to the members for their re-conforting words.

Share this post


Link to post
Share on other sites

Given Tim's travails I can understand his pessimism, but if you are not seeing contamination in the oil (on the dipstick) or in the coolant (look in the tank) I think this is just the common gunk from cold weather. Since I bought my car in 2000 I have gotten this residue in the filler neck during the winter. When I had my intermix it was way beyond what you see here. It would be worth draining the oil to take a good look at it.

Share this post


Link to post
Share on other sites

Ditto on draining the oil. That will easily tell the tale. Also had ugly stuff on dipstick. Believe me I hope its nothing. I have 996 on blocks in garage with engine out. Still not sure what to do since my cylinder heads are not recracked. Cheers!

Share this post


Link to post
Share on other sites

Just as an update, I recently changed from Mobil 1 0w40 to Fuchs Titan Supersyn Longlife 5w40 - no more mayo in the filler neck.

Share this post


Link to post
Share on other sites

I am surprised that a 20 mile drive wouldn't get the oil to proper temp. Approx how long does that take? I assumed when the coolant showed 180* that the car was ready to be driven hard.

Share this post


Link to post
Share on other sites

You might be getting the oil to proper temp to boil out the water. Then it condenses on the long "cold" oil filler tube and mixes with the warm oil mist and "tapioca" happens. That might be part of the reason the AOS has hot water running to it.

If you ever drove a VW bug thru cold winters you would be very familiar with this stuff. Sometimes my 1965 bug would clog the first two inches of the oil filler pipe solid with this gunk. I never suspected intermix there.

Edited by fpb111

Share this post


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.

Guest
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.


  • Similar Content

    • By Vish_ster
      Hello Porsche mates,
      I came upon an intermix issue - coolant with oil, at least the coolant looks like chocolate shake (or coffee with a lot of cream). 
      The usual symptoms before this discovery, 
      1) Temperature indicator lit up even though the operating temperature was around 180F.
      2) Coolant was very low, so filled up with coolant/water but noticed this not so salubrious coolant - very liquid still not sludge like a few other have seen.
      3) May have overfilled cos an overnight leak was found near the right rear wheel....
       
      I had the car towed to my mechanic, the next day, but while he hasn't completed the diagnosis, he does suspect a cracked cylinder head.
      I am wondering about the oil cooler fault as seen in a few forum hits but not confirmed yet.
      Oil is clean - not coolant there...
       
      I may be looking at a $6K hit for this and on the wall towards fixing this, if confirmed as a cracked cylinder head.
      Reasons
      1) 2000 Boxster S has almost 185K on the odo - though new clutch, water pump, 2 AOS, fuel pump, 2 MAF and convertible transmission motors, and a bunch of other regular fixes....it may be worth just as much, $6K , so not sure if it worth spending as much, only to find another $K++ issue lingering around.
      2) Suspension groans once in a while...
      3) Cat throws a P0430 once in a while....
      4) I've driven the car for 12yrs now so wonder if it is time for a change....
       
      Appreciate your thoughts on
      1) Is $6K a fair price for repairing a cracked head or should I shop around, if identified as the root cause?
      2) Given the car's year and miles, is it worth fixing this issue? 
      3) What should be a reasonable price for this car as a roller,  has the M030 package, and litronics but stock otherwise, if I decided to move onto something else?
       
      I realize #2 is pretty subjective - I've enjoyed this car for many fun years and hate to let it go but plunking $KK into an 18yr old car, doesn't seem wise, even if I would like to keep the car.
       
      Thank you for your time here.
       
      Cheers,
      Vish
    • By jaekormtb
      Back in May I found the dreaded oil-in-coolant, followed by coolant-in oil. I got the engine out of the car and the heads off, and away they went to Len Hoffman in Georgia. He confirmed yesterday that I've got a crack in the 1-3 head. He's doing the repair along  with some other maintenance items and port/polish. The lifters and fuel injectors are also away for service. I'm aiming to have my 996 back on the road in the spring, running better than brand new with a bit more umph from the head work. Anyone else had work like this done? Just wondering what to be looking forward to.
    • By jeffg2020
      Just bought a '99 Carrera w/ 28K miles. My intro to Porsche ownership hasn't been smooth, but I love the car so I'm determined to whip it into shape.
      Bottom line, there's milkshake in the coolant reservoir, and I have to top up the oil every day. My mechanic (whom I trust) flushed the thing out a zillion times, but the problem hasn't gone away. He says the engine is shot and needs to be rebuilt by a Porsche specialist. Asking around turns up the notion that it's either a cracked head, cracked cylinder, or slipped cylinder.
      So I need a good rebuilder in the NYC area. Actually I'll go anywhere between Boston and DC, but would prefer to stick close to home. My impression is there are a lot of sharks out there, so I'd love to get people's input about shops they have experience w/ and trust. Thanks!

×
×
  • 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.