20k mile oil change? Really?
 

I was getting a little nervous because the 06' CS I bought a few months ago (CPO'd) hasn't come up with an oil change light yet after about 7k miles. So I did a little digging and come to find out they get oil changes at 20k mile intervals. Is this really what people stick with? I mean, I've never been one to change every 3k like big oil wants you to do... but typically with synthetic I do it twice a year which works out to every 7500 for me.
So is this really what all you guys are doing? 20k mile oil changes?
Anybody with 200k+ on their CS that does 20k mile intervals?

Thanks.

-Mag

hmmm,,, 20k miles interval is news to me.

That is what Porsche called for, they later changed it to 10K I believe. Some think they didn't alter it down to 10K for the early Cayenne's as that would be admitting liability for their error. Some have went through the long intervals Ok, some believe that cylinder scoring that a few of the early CS's had may have been due to the long intervals and the oil breaking down. Who knows? I change mine every 7-9K.

I sometimes think that automotive tribologists have forgotten the existence of dirt and particulates, that they accumulate, and that oil filters have a bypass valve. In other words, it ain't just the oil.

Do not go 20k on engine oil! If you're a betting man by al means.. Seriously, for how much these engines cost you would have to be nuts to go that long. I would stick with 1 year or 7500 miles which ever is first. If you feel like going longer just do an oil analysis to see what the say (blackstone labs). The scored cylinder problem is due to the fact that Porsche did not get the piston to cylinder wall clearance correct from the factory. Unfortunately, no amount of oil changes will prevent scored cylinders in colder climates.

I'm in Florida so really don't have to worry about the cold.
I wanted to get 5w-40 but just realized that it's a 'diesel' motor oil. I've used this same diesel oil in my gas powered boats in the past... but just want to make sure it's ok in our cars too.

Sorry for the newb questions, and thanks in advance for not raking me over the coals.

No problem! Are you talking about Shell Rotella T6? I use that in my Porsche 928 and 944 Turbo. It's a very versatile oil and has a higher content of ZDDP than Mobil. I don't know if any guys are running it in their Cayenne but I don't see the harm. It should be just as good if not better (higher ZDDP content).

I use Redline 5w-40 in all of my cars. In my RS6 (4.2l liter twin turbo) Audi calls for VAG spec 505.01 which is a diesel oil, so they consider it fine for a twin-turbo petrol motor. The Redline 5w-40 isn't their Diesel oil (less calcium) but it meets 505.01 spec and has plenty of ZDDP. I don't put a lot of miles on my cars as I rotate between three of them so I change the oil once a year, always warm them up before driving, no full throttle until the oil gauge is up to temp also, and garage them so they start out warmer than ambient and less condensation.

I used the Rotella in my boat but they have mobil1 in a 5w-40 full synthetic. That's what I'm going to go with unless I hear otherwise from you guys.

i change mine every 5-6k miles. mobil 1 0-30 or 10-30. uses 1qt between changes. 97k on pig now 06 ctts

I went ahead and used the 5w-40 mobil 1 "diesel".

Let us know how it goes. You should have blackstone labs do a test on it after 7500 miles.

There are several good non-diesel 5w40's out there and many have Porsche's A40 approval. Personally I use Motul Xcess.

I went 130+k on my 2004 S using the computer to tell me when, always between 15 and 20K without issue, 0W40 Mobil 1

I would love to see the compression and leak down tests on your engine compared to one that has been regularly serviced. Better yet curious what the top of the heads look like with the valve covers removed.