jpru2001

If you don't want to go into too much detail now because you are further compiling info, we'd all be interested in seeing what you have once you are ready.

I am fortunate to live in (and own a Cayenne from) an area that barely sees temps below freezing (SC)...of course that means I get the info display screen issue, but much better than an engine turned boulder.

alexb76

Is that issue fixed in the new generation V8? or the same applies?

wrinkledpants

It was fixed with the 957 V8. While you still do see scored 957 V8's, they are much more in-line, occurrence wise, with the other motors that Porsche produces.

scottl951

I'd be interested in seeing this data also. My car spent time in Europe. I found a toll receipt under the seat from Austria. It runs fine. With all the early Cayenne's running around in cold climate countries, if the failure rate was really 16ish %, as you suggest in another post, there'd be a class action suit on Porsche for this. I'm not suggesting there isn't an issue. I just think the internet tends to inflate the actual extent of the problem.

westsiderkg

Can't most modern cars, if well taken care of, go at least 200-300k on the ODO? My brothers truck is pushing 275k, but he's taken well care of it thus far and its still on its original motor (2 clutches however).

Miamirice

Totally agree. No excuse for anything less. If replacing belts,pumps, other wear items then such a high end vehicle should go at least 200-300k.

wrinkledpants

Sure - plenty of Porsches out there running around with 300k+ miles on original motors. The interiors will show very little wear, too, if taken care of. None of my Honda's or Acura interiors ever held up that well. Or the motors for that mater. Head gaskets, base gaskets, cracked manifolds - you rarely hear of block issues on Porsches compared to accessories and sensors. And this is with many of the cars making twice the factory rated HP.

I have no doubt the CTT's motor will outlast the rest of the car.

Tennessee Turbo

Heck, I have 207K on my 06 CTTS and it has had all the normal issues, but it runs great and I love that thing. I now have a clunking or rapid banging under the front/right front that its doctor suspects is the transfer case. we'll find out. they cost a little more to maintain, but I have no regrets whatsoever.

Villian

My car has seen -46*F without the windchill (-70's and more with..), has 115k miles and still runs like new. Crossing my fingers, but so far she's been good to me

TomF

The jury is still out on the 2008 957 4.8...the factory changed the cylinder honing process mid-year on the engine, but potentially earlier engines may be at risk, particularly in very cold climates.

Cheers,
TomF

Doug_B_928

From where did you get this information? Last I heard there was a TSB indicating that the honing process changed in 2013, but no one has actually posted it (no longer on Renntech due to copyright issues).

TomF

It was in a TSB posted in a thread here. I suspect it has been removed as well. IIRC, it was engines manufactured after April or May of 2007 that benefited from the new process. I checked mine at the time of the thread and it fell into the earlier category, which was disappointing. I'll see if I can find the thread.

Cheers,
TomF

Doug_B_928

Thanks, Tom. Now it is coming back to me. I think mine is in the early engine #. So was that the TSB from 2013?

TomF

Here you go:

Engine - Crankcase/Piston/Piston Ring Replacement Info.

Service
1
25/13 ENU 1010
Jun 20, 2014
The present document was valid at the time of print. A later version may be available online
Crankcase/Pistons/Piston Rings Need To Be Replaced - Mixed Installation Is Not Approved (25/13)
Model year:
as of 2008
Revision:
This bulletin replaces bulletin Group 1, # 25/13, dated June 11, 2013. Section "Information - Spare Parts Requirements" for pistons and piston rings: Text changed to "now available again".
Vehicle Type:
Cayenne S (9PA)/Cayenne Turbo (9PA)/Cayenne Turbo S (9PA)
Cayenne S (92A)/Cayenne Turbo (92A)
Panamera/Panamera S/Panamera Turbo/Panamera Turbo S
Concerns:
Cylinder liner in crankcase
Information:
If piston rings/pistons or the crankcase need to be replaced, a mixed installation can damage the cylinder liner.
NOTICE
Combination of piston rings and crankcase.
^ Risk of damage to cylinder liner.
--> Observe specifications for permissible combinations.
Due to
^ modified production methods during the manufacture of the crankcase --> from smooth honing to structural honing
^ and the use of a different coating on the piston rings (now DLC-coated)
only the combinations specified below are permitted.

--> Before carrying out any other work, check whether the cylinder liners are smooth-honed or structurally honed:
Date of Introduction:

Only engines with structurally honed cylinder liners are used in vehicles as of the shown engine numbers:
References:
--> 101055 Replacing crankcase
--> 131020 Removing and installing pistons
--> 131037 Disassembling and assembling pistons
92AAH1, 92AAI1, 92AAL1, 970110, 970111, 970120, 970121, 970410, 970411, 970420, 970421, 970430, 970431, 970440, 970441, 970450, 970451, 9PAAH1, 9PAAH7, 9PAAI1, 9PAAL1, 9PAAL7, 9PAAN1, 9PAAS1
Model year as of 2008
C02, C36

TomF

Admin,

Please delete if I am violating copyright. It is posted several places elsewhere however...

Cheers,
TomF