Bore scoring!
 

Little hard to accept that a 5 year old Porsche with 76k miles developed this condition.
Porsche's initial reaction = out of warranty.
New engine is about 22000.00 installed and running and being only 5 years old there are very few in scrap yards
to find a used engine.
Owning a '99 Carrera with 126k and a Cayenne with 161k miles (yes I drive my cars!), I have to say this is a huge
disappointment to have the Macan self destruct like this.
https://cimg4.ibsrv.net/gimg/rennlis...98bdc4dae8.jpg

What engine is it? What were they symptoms? (High oil consumption?) Any possibility of a machine shop re-bore and re-sleeve the engine? Have all services been performed by the dealership?

Man, that's terrible.

Where do you live and drive the car? Is it a cold weather climate? Bore scoring in all Porsches seems to be more prevalent in cars that are driven in cold weather. Did it ever run low on oil? Do you leave it idling in the driveway to warm it up when it's cold outside?

Live in Montreal, Quebec, Canada so yes the winters are cold.
It is in the garage each night during the winter so it wouldn't see below freezing temps.
Oil consumption was not excessive, maybe a quart between regular oil changes.
As a comparison, I have driven the Cayenne all winter, every winter for the last 12 years, parked outside, always starts, even in extreme cold
and never an issue.

The engine is the 3 liter Macan S version from 2015.
Actually the first one delivered to a dealership in my city.
I ordered it new when they became available.

What engine is in your Cayenne - the 6 or one of the 8s? 6s are less susceptible to bore scoring due to cold weather than the 8s.

At night, the Macan is in the garage, but where does it sit all day while you or your wife are at work? That cold can contribute too.

Your 996 mods look impressive. Just curious, were those the result of an engine failure or a preemptive hot-rod build. If a failure, what failed - IMS, cylinder wall, etc?

The Cayenne has the 3.2, 6 cylinder engine.
The Macan does sit in a outdoor parking lot all day while she is working. But was is the alternative, Who would think of putting the Macan in storage for the winter like the 996!
The mods were something that I had been eventually planning to do as the engine got older. When I made the decision and dropped it of for the work, the IMS flange and bearing actually
could be made to wobble. I was literally at "death's door" and should have purchased a loto ticket that day!
Very happy with the results, the engine a way more torquey from a stand still. It is a lot more fun to throw around now.
The only downside is that being a '99 throttle cable year, no one makes a good ecu tune that would tie the various improvements together and I am still
on the research for a reputable tuner with a dyno who could make a custom tune based on actual dyno readings.
I have been told that the best bet would be to find an experienced Subaru engine tuner!
Not in a rush for that and it may never happen as the results may only be marginal from where it is now.
cheers
Peter

What symptoms were you having that prompted you to get the cylinders checked?

There is quite an obvious ticking sound at idle. In this case on the drivers side.
Similar to when lifters fail on our engines or on older North American engines, loose rocker arms or hydraulic lifters failing.

My wife's Macan S is getting oil changes every 5K miles. No way am I stretching that out any farther than that. A 0W40 oil run at a long oil change interval seems like a recipe for disaster as the additives break down.

How long do you let it idle after an initial, cold start up? Or do you fire it up and drive straight off? Lastly, are you the sole driver or does someone else drive the car on a regular basis?

Hey Mark,
It is my wife's car for her use entirely.
I have driven it maybe twice in the last 5 years.
I have the 911 for the summer and the cayenne for the winter that I use.
To my knowledge, it's less than a minute from start up to putting it in drive.
The engine shuts off at traffic lights etc as a normal function.
She is scared of speed so I know that she has never pushed it.

Was it just one cylinder or several? What gas have you run?

2 cylinders, #4 and #6. usually filled filled with 91 Octane.

Clearly this is a failure, 100% on Porsche. If their cars are not suitable for a cold environment, or can not stand up to normal human behaviors than they should not be sold in those markets. Enough with blaming the customer for 996 IMS issues, failed transfer cases, leaking timing covers, etc. All 100% poor engineering, poor vendor management, and poor quality control.