How often do you change your oil?

I've got a 2005 C4S. The dealer told me that I can go 15k miles without a change. Should I wait that long?

i change the oil on my cars once the break in is finished and every 7500~ miles there after

MY dealer said it can go 15,000 but they recommend every 7500. I did it at 7500 and the oil was very clean. I will continue to do it every 7500. (with mobile 1)

For those that don't do the oil change themselves and do it more frequently than 15k - do you use a Porsche dealer to do the intermediate change or something like Jiffylube?

My interval is 7.5K like Tom's and I do the oil as a DIY. This is a VERY SIMPLE DIY. Not to mention the cash you can put back in your pocket.

it will definetelly won't harm the car if the oil change is earlier than what you have been told.. i would go for 7.5 k

My 996 TT has over 200'000km (124'000 miles), and I've changed the oil every 20'000km (12'400 miles). If PAG says it's the way to do it, why do it more often? Do you change your brake pads when they're half-thick? Greetings, --Pierre

IMHO oil change intervals are dependant on the type of driving you'll been doing and the mileage you'll accumulate. I.E. if you drive long distance computes, for instance 50 miles each way at freeway speeds, then changing oil at 15K is fine, but if your driving is short trips at varying speeds(stop & go) then you'll need to change the oil more often. The general rule of thumb is change the oil at least once a year if you don't reach the factory recomended interval.

Every 5000 k or around 3500 miles

I change my oil every fall just before I put it away for the winter. I put about 5K miles a year on the car. It is probably overkill but it is easier to change oil than engines. Remember Porsche only needs to get past the warrenty period I intend to keep my car probaly 10 years. YMMV

i have the dealer do it, usually the car sits there overnight, i always get a porsche loaner. about 300$ each time. im consumed with other things to change my own oil... i only let the dealer touch my car.

it also depends on weather conditions... Pierre's car ( in fact photos of the car) were taken at a -7 degrees clcius.....and of course this temperature has nothing to do with Dubai's temp,...... i.e oil change intervals , will be shorter at higher temps countries....

Here is my personal philosophy with reagrds to oil. If I run my car hard (which I tend to do) I change the oil, at the most, every 5000 miles. If I have a DE or Track weekend, I change it when I return. Simple preventive medicine. Oil is the life blood of the engine. Changing it often is not a bad thing at all. Just my .02. Chad

I agree with Pierre. Time ago I asked my Porsche Dealer to change it before time and he insisted that it did not make any sense.

Do you guys know any link to a DIY post. I just want the torque setting and other small details on how to do it properly. Ciao, Marc

Try Loren's site (renntech.org). He has a wealth of TECH information. Very good site. I have been a member for some time and visit it at least once a day.

someone mentioned before that they change their oil based on track hours. every 10 hours or so of DE driving they change the oil. sounds like a pretty good plan for me, since i track my car fairly often

I'm with Pierre and others, if the factory says 15K miles, then change it then. I did mine every 12K miles or so, but only because the dealer was doing other work and I got a good deal on the change at those points. It wasn't much more than doing it myself (once it was free!), so I figured I'd just let them do it. The detergents in Mobil 1 will last 25K miles, but the filter in the car starts to wear out around 15K. Plus nobody is going to recommend a 25K oil change interval for a car!

every 3000 miles

My dealer told me that Porsche stretched its change intervals in part because it counts against them as emissions somehow. I'm changing mine myself at 5k intervals, and having my dealer do the 15k intervals, just to get a stamp in the book. I trust myself *way* more than I trust the goon at the dealer, though.

I'm not an engineer, so when the Porsche engineers say "15K", I say "yessir!"

Stiles is right! NOTE: MY PERIOD KEY IS BROKEN At least in the US, cars are measured on total emissions including used oil, That is why you see the very long oil change intervals, On my race car I change the oil after every race weekend, On a street car I would never go beyond 5000, I don't think you will find an independent Porsche mechanic that would disagree, Jim

I say change it every year - but that's just my opinion... then again, I don't change my underwear everyday either.... eww. Ok, I'm kidding.

I change mine every 10k miles. 0w-40 Mobil-1.

i think this would be a good topic for a poll. i do find it interesting that pierre follows the factory rec and has done well. i change oil every 15k mi both for my c4s and 996tt--the oil seems so clean when i change it that i am confident i'm doing the right thing

At least we are all at or below the suggested interval. It never hurts to change more often but it can be detremental if you change too late!