Porsche just replaced my 2005 Carrera S engine at 10K miles. The car is two years old. It has had high oil consumption since new. The oil consumption at the time of engine replacement was approximately 450 miles per quart of Mobil One 0-40W. On inspection the engine had a 46% leak down in cylinder number 4 vs. 1-26%;2-16%;3-15%;5-20% and 6-23%. Boroscope inspection showed cylinder number 5 had scoring and marks from extreme heat on cylinder wall. Since the engne tear down is done in Germany we may never know the etiology of the problem. Does anyone have any ideas? Originally I thought it was a ring issue but now I wonder about inproper coolant circulation in the block. Any ideas? I might add the engine ran well with good power output. The only visible sign of a problem was high soot on the left tail pipes vs. the normal right side. The car had been broken in properly and never tracked. The operating water and oil temperature were always normal as was the oil pressure. The new engine is fine at 100 miles.
Thanks,
Mike

 

Having a water artery some how obstructed sounds unlikely. Possible issues with the rings creating an unusual amount of friction sounds more likely, as if the tolerances weren't spec'd correctly upon assembly. The engines are tested thorougly before leaving the factory and I'm surprised that it made it out with this type of issue. I would really like to know what the issue was. Too bad they break it down in Germany.

 

Id guess that it was a ring failure, or an injector failure, too much fuel in the hole will wash the cylinder walls then its all over.
glad they took care of you

 

My 06 S has gone through 1 quart every 1000 miles. At 3200 miles now. Hoping it will settle down soon. Will keep my eyes open to this.

 

Edgy, that sounds like an awful lot of oil to be burning through, not to hijack the thread, but have you talked to the dealer about it yet?

 

I second that a quart every 1000 miles? I'm 2/3s into a quart at 4500 miles and I wish it used less.

Also I've been preaching to keep the oil level 1 bar below the top marker, the oil level indicator is not as accurate as a dipstick and I think to get a good reading the car should sit at least 24 hours.

The longer the car sits up to a point the more oil the indicator will read. I find it odd that I can let the car sit for 1 hour and come back in and it takes only 6 seconds for a reading.

IMO Porsche needs to increase the granularity of the electronic gauge or give is a fargin dipstick

 

997s only take a reading under perfect conditions......completely cold over night ect.
when its hot and it takes 6 seconds its only displaying the last knonw good reading.
theroyeitcly you could drain the oil hot and it would still read full. iahve tested that but its what i was told

also if you feel that you have high consumption, you will need to take it in to the dealer have them open an ro top off oil and bring it back at intervals to check and top off, have them open an ro each time so theres documnetaion

 

Since I haven't gotten the car back since using it in Europe I have not had the opportunity to check oil consumption over on this side of the Atlantic. Will be monitoring it for it's rate of consumption. Hopefully, it will settle down. I'm quite sure that I never overfilled it, always waiting through the dipstick timer to tip me off to the levels present.

 

I just had my engine replaced in mine too. MIne is a 2004 996 that I bought as a new left over this past December. It now has 5k miles on it. I had the exact problem with my engine that you had. Repeated misfire on #4 cylinder and a good bit of oil consumption. I broke it in as told, never track, never redline, etc. It is a daily driver. Perhaps it is just coincidence, but seems odd that engine that were made a year apart have the same problem.

 

Glad to hear the new engine is working well...is your car an S?

 

I think he stated that up front "...Porsche just replaced my 2005 Carrera S engine..."

 

Missed it...sorry, I guess subconsciously I did not want to see it was an S

 

Is it possible to get P to extend the warranty with these new engines? It'd be nice to get a little more protection for the hassle.

 

Thanks for the input. The car was broken in properly. It must have been a ring issue. Lets hope it is a rare problem in the Carrera S. I have owned a number of Porsche's over many years and this is my first engine replacement.
Mike

 

The engine Serial number is matched to the Vin number during (production). How will Porsche resolve this issue since the engine was replaced (vin and SN will not match on the new engine install)?