Cerbomark nailed it when he said that the prior owner's driving habits had likely caused that and it isn't something you've done. It will likely hang around unless it is cleaned out but that would be good to do just to make sure it doesn't indicate something else, which is quite unlikely. Unless you are sure the oil was changed recently it might be good to do so. It's not cheap though since you need nine quarts of quality synthetic... welcome to Porsches.

But based on your comment, I want to make sure you realize that all all makes and models of cars including non-Porsche ones have the same problem if driven short distances. Water will accumulate in their oil and froth as well, but the placement of their oil filler caps limits the degree to which it is visible on most non-911 cars. You'd have to look deeper inside their engine to find it. It is not unique to just 997s, it just happens that it shows up in our filler caps more than most makes and models of cars... but you would find it in those cars if you could see into the right places.

 

I respectfully disagree here. In 10 years of ownership and 42k miles I have never seen other than a clean healthy looking filler tube. As I suggested the key is to run the car to normal temps and allow condensation to boil off. For this you need 212 or so degrees and 15-20 minutes of running at that temp. Spirited driving is part of the 'cure'. Semi annual oil changes, even at low mileage, helps. This takes an awareness on the part of the owner and an adjusted driving routine. Mine is not a high mileage car or a daily driver but when I start it I drive it within the suggested parameters. makes for a happy driver and a happy motor.


If the filler tube and the drained oil looks clean there is nowhere in the properly maintained motor for crud like that seen in op's posting to accumulate. I think it is a mistake to accept this contaminated scenario as 'they all do that'. Just not the case and not a function of the engine design. It is indeed a reflection of the drivers routine. I do hope op enjoys his car more that the previous owner did

 

Gpjli: I can see why you disagree with that interpretation of what I was trying to say. It appear this is the second time in as many weeks that I chose words that were easy to misinterpret. It actually took me three times looking back and forth between our posts to figure out why you were disagreeing with me. I'll go back and clarify that statement in the original post, just for the record.

Here is what I said that could be interpreted incorrectly: "... all cars exhibit this same behavior". What I was trying to say, "... all makes and models of cars including non-Porsche ones have the same problem if driven short distances. Water will accumulate in their oil and froth as well, but the placement of their oil filler caps limits the degree to which it is visible on most non-911 cars. You'd have to look deeper inside their engine to find it".

When I was a teenager I would work on neighbor's cars for money at times, doing things that at times would require moving the valve covers or more. The amount of foam and or sludge I'd find down inside some engines was quite a surprise sometimes. It was also one of the things that help sell me on synthetic oil. I was an early adopter of Mobil 1 way back in the late 1970s. When I had some engine trouble in my Buick Turbo (my first "hot" car) at 70,000 miles, I removed its valve covers and everything was still sparking clean. It was the first time I'd ever seen a car with absolutely no sludge build-up somewhere in the upper end of the engine. I was sold 100% after that.

 

[QUOTE=StormRune;4485730]Gpjli: I can see why you disagree with that interpretation of what I was trying to say. It appear this is the second time in as many weeks that I chose words that were easy to misinterpret. It actually took me three times looking back and forth between our posts to figure out why you were disagreeing with me. I'll go back and clarify that statement in the original post, just for the record.




Yes, message board communication can be difficult. I have learned the hard way and try to keep a sense of humor about it. "What you think you just heard me say is not what I thought I meant"


I now agree with you. Except you need to change to Motul asap.


Jka. ? Cheers