What mileage oil change?

I was just curious to what kinda mileage the majority of you guys are changing your oil at? I used to go back and forth with the guys on the Vett forum. These guys would let there car go 7 or 8000 miles between oil changes, because they believed the computer was SO right in telling them when it was time. I personally believe the more often the better......within reason of course. I like to about every 3-4K miles.

Every 5k miles w/ Mobil 1 for me. Keeps it simple.

Every 5k or 6 months with Castrol 5w-40. Fortunately I have been hitting the mileage before the months have passed

Every 15K miles or 2 years, which ever happens first.

Once a year whether it needs it or not. Every 3-4k miles seems like overkill to me. Also, am I completely imaging the point that because of the design of a flat-6 engine with nine quarts of oil, it doesn't make sense to compare oil change intervals to a "regular" car like the Corvette? FWIW, Porsche says every 2 years/12k miles for the later 996 cars...

I go every 2 years on the P cars, which is 6k-10k miles. More important than change intervals, is starting the car often and letting it run a few minutes. Do this at least weekly during periods when it won't be driven. More damage occurs form being domrant than running. Oil that sits for long periods becomes laiden with moisture from condensation and becomes more and more acidic which in turns starts etching and damaging engine components. Anyone that opens up motors often has surely seen this. You will do no harm by changing the oil very often, But even with clean oil and very few miles the damage from internal corrosion does happen.

My porsche mechanic told me once a year. It just feels wrong, but considering it costs 4 times the "normal car" oil change, I won't complain

I do mine at least once a year, and average 4-5k miles of driving in 12 months. In the 17k miles I've driven over 4 years, my oil and filter have been changed 5 times to date.

Different model, but interesting poll results: https://rennlist.com/forums/993-foru...how-often.html

I thought oil threads were like IMS or RMS....taboo! I have had my car for a year this month and am planning on changing the oil every spring. My guess is about 4K per year in miles. My indy said two years on the oil really is not a problem based on my annual milage. I have a friend who puts about 1500 miles/ yr on his boxster and changes his evey year. Annual is also what the local pcar dealer advised.

FWIW, when I had my PPI last year at this time, the car oil was two years old and had about 3K since its last change and pcar dealer recommended oil change in the spring.

Every 6,000 miles on the 996 turbo which is a DD. Once a year on the 993 turbo that doesn't see many miles.

10k miles or one year...

3k with some DE in between....

Every 5k on the "0" or "5" just to keep it simple. Too often no doubt but I credit Texas heat and DE's

I change mine every fall which usually coincides with about 7K miles.

My indy mechanic recommends every 5K miles, whenever that occurs. I choose to go with every 6 months instead, which works out to about 6K miles.

Every spring I take it in for it's yearly service. Usually I will have driven between 3-4000 miles. I'm going to start oil testing next year and do the oil filter exam. Meant to start this year, but I forgot to get an oil sample when the service was done.

7.5K/annually

Quotes source post: 7973671

Bad idea for two reasons. If you let the car idle for only a few minutes you will build up water in your oil. Same with short trips. Long runs are needed to heat the oil enough, and for long enough, to purge the water. Short trips and idling for a short period will cause a build up of water and that water will condense in the engine in the cold months. Open your oil filler cap after a long drive and you will see some steam coming out, and maybe some milky stuff in the filler neck. That will give you an idea of the water in the oil. The other thing is that after a long drive oil will have been as widely distributed to as much of the engine as possible. Once the car is shut down a thin film of oil will be left behind which will protect the metal from corrosion. Running the engine and idling for a short time will remove that film and not be long enough to lay down a new film everywhere.

Change oil on your birthday or 5000 miles whichever come first.

I appreciate all the replies. Thanks! I put on 8000 miles since I got my car last Feb, so it will definitely be the mileage that is my deciding factor, and not time. Thanks again gentlemen!

Quotes source post: 7975151

Sounds like a text book reply. With all due respect, you got some of it right, but you are still not 100% clear on what actually is going on. I admit, it's best to take a long drive every week and let the car reach full operating temperature, and keep it there for several miles so all the moisture burns out of the oil. This in reality could take a long time, hours even. Short trips and short running cycles do not necessarily add water to the oil in and of itself. Where water is a byproduct of combustion, the water doesn't enter the oil as a result of running. It enters thru the valves that are left open to the atmosphere when the motor is not running. Inside a motor is mainly air spaces, and the air naturally contains moisture. Condensation naturally occurs with temperature changes and as it cools down at night droplets form on areas above and end up falling eventually into the oil sump. Being heavier than oil the water collects at the lowest point. This cycle continues daily with temperture fluxuations when a car sits. The oil that coated all internal parts while the motor was running starts migrating to the lowest part of the motor as soon as the ignition is turned off. After sitting for several days, the oil film becomes virtually non existant and can no longer protect critical parts from corrosion and oxidation. Different chemical compounds in the oil itself and all the internal motor components in the presence of moisture added with combustion byproducts produce acids. So now we have acidic moisture droplets forming and dripping on critical components that have sloughed off their protective oil film. This is where major wear begins inside a motor. Not from running, but when sitting for days, stored, all the while the owner is clueless at to what's really going on. You can interrupt the cycle by starting the motor. Even after a few seconds of running, oil will reach and coat every moving part. Longer is better, but just a few minutes is much better than nothing. While you're at it if you move the car just a few feet, you will coat all the wheel bearing ***** with a fresh coat of grease a work the clutch and brake components.

Quotes source posts: 7975151, 7975817

C'mon you guys, it's both a dessert topping AND a floor wax! The 1 year recommendation is just a guideline. Can't really know without a used oil analysis. FWIW, I've had a few UOAs on my cars (P cars and others marques) with a number of different oils and NONE of them lasted more than 10,000 miles/1 year. Sometimes the oil doesn't even last 5,000 miles. Sometimes the total acid number (TAN) and total base number (TBN) indicate the acid fighting ability of the oil is depleted. This happens even if the water content of the oil is within acceptable spec. I've never had a car with low mileage and extended time interval, that would be an interesting UOA to see. Irregardless (is that even a word?) of oil, if idling my car for a short time I like to make sure the exhaust system gets up to temp. I don't want the combustion water condensing and rusting it out prematurely.

I wanna say one more thing......changing your oil often and not getting too ridiculous, though expensive, will only do good for your motor. Changing your oil at longer intervals, will only, if it does anything at all, will let you motor wear a little more quickly, but definitely will not do any good for your motor, I think all of you would agree.

Quotes source post: 7976509

Same logic as toilet seat covers

Quotes source post: 7976112

Happy friday! Irregardless is not a word. And i agree that 10k is too long for even the most high tech synthetic engine oil.

Quotes source post: 7976509

Ah, but the problem with that logic is that if you want to do the best for your car, you'd change it every week. It's all a compromise...

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Every weekend for me.

Every 4 to 5 thousand Kilometres for me, oil comes out clean everytime... I currently use 0W40 Mobil 1, but I wouldn’t mind trying a better oil. I’m just more confused than ever on oil discussions so I don’t even want to get into it yet.

I change mine every 5k or 1yr which ever comes first.

Spring and fall, regardless of mileage. I'm not worried about the oil itself, but about the water buildup that comes from short trips and cold weather use.