importtuner

I know Porsche recommends this, but I feel uncomfortable with the idea of it. Oil degrades over long use and many modern engines consume it. I think long term, longer intervals will cause sludge and starvation issues. What are your opinions?

deilenberger

The 10k interval assumes very gentle use of the vehicle. I do 5k intervals because my Cayenne frequently is driven short distances where the oil doesn't have a chance to fully heat up (which causes water to be absorbed in the oil from the PVC system). Less than 5K would be if the vehicle were driven regularly in dusty conditions or at extreme high temperature conditions.

cfiiman

I change mine at 5000 or 1 year whatever comes first on my 955TT and 996TT using Mobil 1 0W40 European.

Tom M

I do mine at roughly 7500 miles, sometime less. I did the same for my Boxster when I had it. I shortened that to 5K miles when I'd track the car.

The 10K interval is a way for Porsche to reduce the cost of ownership during the warranty period. They really don't care too much about the longer term effects of extended maintenance intervals.

RAudi Driver

I do the 3k oil changes.

Pmorritt

JimboMac

Texas993

ditto

leftlane

whitecayenneS

My Cayenne S holds 9.5 qts. which is about double the oil vs a non-turbo engine. Twice the oil, double the service interval. You can also send a sample of your used motor oil to a lab for analysis. They'll tell you how much of the additive package remains and how many additional miles you could have gotten out of the oil (additional $10 for that test). That said, I change the oil and filter every 10,000 and just the oil every 5,000. With today's high performance synthetic oils that's more than frequent enough (in my opinion).

https://www.blackstone-labs.com/standard-analysis.php

From the lab website:

Ok, now for the technical questions. What is a TBN?

A TBN (total base number) measures the amount of active additive left in a sample of oil. The TBN is useful for people who want to extend their oil usage far beyond the normal range.

Do I need to send in a separate sample for a TBN?

No. We can run your TBN on the same sample of engine oil you send. It's also not necessary to send in a sample of virgin oil for a TBN. You're welcome to do so, of course, and many people do this to see where the TBN starts out. If you do send in the virgin oil sample, the cost for that sample is the same as for your used engine oil sample.

deilenberger

If you ask them - they often have TBN from a virgin sample done earlier for most commonly used oils. In the past they have graciously run a TBN on a virgin sample I supplied - at no cost to me. It was a specialty oil that many BMW M3/M-Coupe owners with the S54 engine were using, Castrol TWS (10W-60). I assume they saw the value to have those numbers on hand since people were sending in samples to be compared (great engine, just the usual BMW problems of Vanos disaster and undersized bearings..) in the hopes of catching impending damage before it required a new engine.

marinerbc

For my 2016 CTT Since I do not drive that much, maybe 8000/10000 km/Year mostly short drives , thus I would say that is a sever duty condition . I do change the oil twice a year . for the summer in April I use AMS oil "Porsche A40" 5W40, in October I use Mobile one 0W40

quickster2

5K here with transfer case every 10K. Always a new filter as well. Cheap insurance if you are going to keep the car for long as I do.

chiapet15

I do 5Kmi oil change intervals for my Cayenne S eHybrid because using the engine in a hybrid is equivalent to frequent short trips, and the oil gets contaminated with gasoline because it never reaches or stays at operating temperature for long

Like others, I'm very wary of the transfer case issues and replace the transfer case fluid every 20Kmi, differential fluid every 30Kmi, and will do the tranny fluid at 50Kmi