19psi

In sub zero temperatures, the wrong viscosity of oil will turn into molasses...it simply gets too thick to flow. In many cases, the starter isn't even strong enough to turn the engine over.

5W is still pretty thin; however, on an engine that's prone to scoring in cold, I'm going to use the thinnest recommended during the winter.
If Cayenne engines were known for scoring in places like Florida and Arizona, then I'd go with a thicker viscosity.

deilenberger

Just from memory, 5W-40 oil is approved by Porsche, I believe starting at -15F, which it happily has never gotten to in New Jersey. My turbo started life in Atlanta GA, now lives in a heated garage in NJ.. 5W-40 should be just fine.

BTW - one logical failing in the discussion of if this noise indicates scoring taking place. While a particular engine may have exhibited a noise on cold startup, and then suffered a cylinder failure - there is no direct correlation between the two. A direct correlation would be if ALL engines exhibiting the noise suffered the same failure and if ALL engines that failed exhibited the noise prior to failure. Anything less is really a guess based on inadequate proof.

Good discussion.. please keep it going.

flblue

OK, I'm in Florida, so which oil should I be using?

deilenberger

One might be tempted to suggest opening the wners manual. There is a nice chart of temperatures and suitable oil grades.

wrinkledpants

No. I typed 30W but in my brain thinking 30 (W)eight.

1BadAction

Well I expected this thread to turn pear shaped worse than it did, way to pull the nose up guys.

0w-40 Synthetic is pretty common locally, as is 5w-40. Since I'm ordering anyways I'll probably go to a 5w-50 since Dallas will never see near -15, let alone below it.

Torre

So I was over at the local indy shop today and thought I'd ask about this.

I live in a europan city with around a 500k population. Apart from the official Porsche Dealer there is only one Porsche-Only Indy here, servicing an area of around 1,2 million people.

They have replaced one 957 Turbo engine and one Panamera Turbo engine, ever. 955 CS engines they have replaced 20+. They've also replaced more than two 911 engines for cylinder scoring.

wrinkledpants

That sounds about right.

deilenberger

Since Porsche has produced something over 400,000 Cayennes since 2011 (found that out from the latest recall publicity) - and I'd guess at least 1/4 of them are V8's - I think if this problem was endemic we would have (1) heard about it (2) have a class-action lawsuit to join in. Even with the several failures reported here - the actual probability of it happening to any V8 is exceedingly low. That's unlike the 955 V8 coolant pipes where eventually almost ALL did crap out.

mcbit

Admittedly I live in a warm climate, but neither of the 2 biggest Porsche specialist indies (Abu Dhabi & Dubai) in the region has ever seen a Cayenne with scored bores and pretty much all of them are run on Mobil 1 0w40 or a cheap dino oil if run by someone who doesn't care.

Dan87951

I think you have a better chance of winning the lotto than getting scored cylinders on a Cayenne Turbo. Some Porsche club members and I have had no problems with our cars. Mine is in a garage both at home and at work but other Porsche club members leave their Cayenne Turbo's outside year round and have triple the mileage mine has with no scoring. However, like any machine failures will happen and feel horrible for anyone who has to go through a engine rebuild on these cars because it will not be cheap!

TomF

+1

dubl07

Ok so to update. Tapping, hammering sound is still present. Even a little more noticeable. Now Ive developed a slight shake when parked or at a redlight. My ice coffee now rattles when in the cupholder at a standstill.
Im almost positive i have at least one scored cyllinder. Performance at low rpms seems very slow or sluggish until the higher RPMs.

The car is itself has been meticulously maintained, owned by a Wealthy CEO and has 10's of thousands in reciepts for maintenance and repairs performed, all at porsche. It has 103k on the clock. Ive had it since july. It had 90k when i bought it. Ice done 3 oil changes and the 90 and 100k mile reccomended maintenance since ive had it. Also had to replace the steering column for $5000😭.

Another note, i drove the car to dinner valentines day here in boston. If your from around here, it was 0 degrees with a windchill of -30below that weekend.
I drove carefully and slowly that night, but i did valet my car, so i cant rule out that it was driven hard in that temperature.

I intend to bring it in monday to have them look into it again.
The last time they kinda just said that noisy engines are normal in these, but im gonna press for a boroscoping of the cyllinders.
I obviously dont have any warranty or anything, so what are my options if it is in fact scored cyllinders. Is it still driveable? How long could i drive it like this. Im definitely not a rich man so im not exactly sure what i would do if i need a new engine.
Would they take a kidney in exchange?🤔
Could i run 5w-40 to quiet the noise and trade it in somewhere?

RT930turbo

If you are starting to notice roughness at idle, with increasing noise that's not good

I would open the oil cap while it is running to see if you have any blowby. You will see / feel pulses of air coming from the cap if you have a cylinder scored badly enough to cause a compression leak and subsequent rough running.

If you plan to fix it, there are a few options, none of them inexpensive i'm afraid. If you continue to drive it to total failure, it could become completely un-fixable.

Unfortunately whatever path you choose, the cost will exceed the value of the car.

As for disguising it and trading it in, I couldn't do that and sleep at night. Might be worth trying to get an offer on it and simply disclose the noise as is.

Best of luck, I know it's heartbreaking.

dubl07

Thanks for the feedback. I have a few questions.
What specifically would the repair options be?
How much does a new short block from porsche cost?
I've read the thread on 'cayenne engine replacement' and I've seen the replacement range from 10,500 to 27,000. Why is there such a wide margin.

As far as rebuilding with flat6 or 928 motorsports, approx how much does that cost all in?

What route are you taking?

Thanks for all the info in this thread, its been very informative.