Falcondrivr

I could only vote once. But I'm on my second '07 C4S. 1st one I sold it around a year ago with no scoring, 68,000 miles. Current one, no scoring, 78,000 miles. Both southern cars.

Racetwin2

NO issues with scoring etc.

My car Is a 2007 997.1 C2S convertible driven originally in Germany and then Sweden. 54.000 km. Mainly driven during March-October. Always heating up (oil temp) before revving and always started driving directly. No warming up in garage. Started many times close o zero degrees Celsius

Alfaguy2

Sold my 2005 997.1 C2S yesterday @ 50,000 miles - never a problem with scoring of the cylinders. The new owner done exhaustive testing for this but nothing negative showed up.

cibergypsy

74,500 miles on my '06 Carrera S with Powerkit... had a major service done in March and took advantage of the spark plug change to borescope the motor... No signs of any scoring on it! No oil consumption and runs perfectly. It has been a Florida car its entire life and I have been its only owner. Great car!

Sneaky Pete

Bought my 2005 with scored cylinders.

alan111

'06 911 S with 24k miles, no scoring. Had plugs and coil packs changed today and used the opportunity to borescope the cylinders. According to Formula Motorsport here in NYC, all perfect with no scoring at all. Car was a one owner, services only by dealer and has always been a Northeast car.

vitman

2006 997 S - Florida car - no cold weather - no track use
Lots of smoke/soot starting at about 75K miles
Bore scoring
Engine replaced at about 80K miles

CamoRR

How can I test bore scoring? Just doing a compression test?

Jason F

2006 Carrera S. 86K miles. Several track days under my ownership in the past year. No Bore Scoring, 230-235 compression across the board.

aaks38

Just curious, from reading the first 2 pages of this post, it appears bore scoring is primarily showing up in the 05-06 3.8 models, or does it extend to the 07-08 models as well?

997_rich

You can just use a boroscope/endoscope to inspect when you change your spark plugs. They're getting really cheap now.

Sal T

Hello, 997.1 c2s 77oookm no:6 heavy 4 and 2 some, mild climate in Istanbul, a few days is smow. Noticed stain on Crome pipes, pulled the plugs looked inside. Did a do over. Should this be under warranty. Regards

Ericson38

What oil did you use and what change interval ?

Is there anything you are doing differently with the new engine ?

Sal T

Mobil1.
I completed the post 2000km today changed the filter and the oil.Filter had 3 small pieces of metal in it. This time I kept the rpm below and around 4000. I am very careful not to push the engine while cold. But I think this is a engine design problem.

JustinCase

Yes. 2008 C2S Cab -- some scoring near the top of cylinder 6.

Since owning this car I have been scrupulous about keeping it under 4K until the oil reached 200 F, never tracked it. I have been sending in oil samples to Blackstone for the last several oil changes (@ 4,000-5,000 miles each). The analysis always returned very favorable results.

After noticing the sooty LH tail pipe, I had a leak-down test run (normal results) and the #4 plug pulled to check for wetness on that side. Dry. Same story for the next oil change.

This last oil change was my 36,000 mile major service, and all the plugs were changed. #6 was wet. Since the plugs were all out, they borescoped all cylinders and found the scoring at the top of #6. Blackstone flagged the increased oil consumption and noted an ever-so-slight uptick in Aluminum, which I doubt would have concerned them unless they knew about the oil consumption. Basically, the oil analysis was still completely in bounds.

I am currently driving my car every day (with an extra quart of oil in the boot) and carefully recording the oil consumption to measure the magnitude of any additional changes. My plan is to continue driving it, checking #6 with every oil change.

If I can stretch it to 72,000 miles (the next major service), I will have the engine rebuilt then. I would not be surprised to have to pull the trigger much sooner, though, if the scoring worsens or the valves gunk up too much and throw CELs right and left.

Thinking about either a 4.0 liter bore, or an X51 upgrade when that happens. Saving my pennies, and the savings balance at that time will likely determine my choices. The smart money is on a basic rebuild with LN bearing and oiler system, but no fancy stuff.

Once I became sensitized to the symptoms, I have noticed dark LH pipes on a LOT of 997s. I suspect there may be plenty of milder cases that are deteriorating more slowly, but are not recognized yet.