Just curious. Some cars do and some don't. I haven't noticed anything significant yet but just in case i check one day i don't want to accidentally shat myself.

I am doing oil changes every 5k with Mobil One.

Thanks.

 

Yes. Although my last '09 2S burned more than my '08 Turbo for some reason.

 

very minimal for me. Maybe 3/4 qt in 5k miles

 

If driving relatively sedately I can go 1000's of kms without the need to top up. When hooning for extended periods it definitely burns a bit more, especially at the track.

 

I average 5-6K miles a year in my 2011 997.2tts with an oil change every year and I have not noticed any oil consumption at all on the onboard computer measuring stick. How accurate that is I'm not so sure. I wouldn't be surprised if it doesn't register a 1/4 or 1/2 quart consumption.

 

Same consumption here.

 

This is my experience with my 2003 Turbo. A 4K mile highway drive with very little "hooning" will have the oil level down maybe a bar after 4K miles.

OTOH, a very spirited drive -- if you know what I mean -- over a nice stretch of mountain road can have the level down 2 bars. It is almost like the oil level drops as fast as the fuel level in the fuel tank.

The oil is consumed by probably 2 ways. One is during spirited driving with lots of high RPMs the engine naturally generates more oil vapor more than it normally generates when run at mostly lower RPMs and under less G forces.

The AOS allows more oil vapor through to the intake and into the engine where the vapor is burned.

The 2nd way is via the turbo seals. Under some conditions oil can leak past the seals (better than having exhaust gas or pressurized incoming air leak past seals into the bearing). If the leak is to the intake compressor side the oil is burned in the engine. If the leak is on the exhaust turbine side the oil is burned in the hot exhaust.

 

I believe porsche says it's acceptable to burn 1q per 1000 miles - I have questioned this before and told it was normal.

This was true on my cayenne turbo as well.

 

a quart per 1000 is totally unacceptable. By the time you're due for an oil change you've already changed all the oil in the car....

 

Well, you might think it unacceptable but Porsche won't. Absent any CEL or other signs of engine distress 1 quart/1000 miiles oil consumption is not going to get you any attention at the dealer at all.

IIRC the threshold of when oil consumption becomes a concern to Porsche is when oil consumption gets to 1 quart in 600 miles (1l in 1000km).

Oil consumption is like fuel economy, tire life, brake hardware life, etc, in that someone always has a car that uses less oil (or no oil), gets better fuel economy, longer tire life, longer brake life.

One's car does what it does and is not affected by other cars.

All one can do is recognize that some types of usage can affect oil consumption and avoid these if possible. Exessive/prolonged idling, extremely high RPMs and spirted driving. I will add running the oil too long can also contribute to higher oil consumption.

If one's car appears to use a bit more oil than is "normal" be comforted by the fact that as long as the engine doesn't emit any oil smoke when taking off from a light or when given lots of throttle after a distance of closed throttle coast down the oil is not getting past the rings or by the valve stem seals but is probably just oil vapor being passed through the AOS and in the case of a turbocharged engine possibly past the turbo seals.

In this case then the oil consumption is a very minor inconvenience. I carry two bottles of oil in my Turbo's front trunk because over the span of 5K miles I know at some point the engine oil level will drop by a quart. Depending upon how I drive the car it can make it to 5K miles and its next oil change with just the 1 quart but if I engage in driving that I know can increase oil consumption I might have to add the 2nd quart because I prefer to run the with engine (both my engines) with the oil level at the max line but not above it.

 

If my vehicle burned more oil between oil changes than it used for the oil change itself i'd dump the car in a minute. You can justify to yourself all you want that it's "Ok"...but it's not. Engines are engineered to burn fuel...not oil. Some consumption is acceptable...but a quart every 1k miles is not.

 

I'm not sure why this incorrect figure gets quoted so often.

Porsche spec, at least at the time these cars were produced, is a max consumption of 1.6 liters per 1000km.

That, friends, is a quart of oil ever 366 miles.

Total bull****, as per usual at porsche

 

I've not seen any noticeable oil usage from my car in the 20k miles that I've owned it. I've only done 5k, now 3k since it's on E85, oil change intervals though.

 

1 quart per 1000 miles are hard drive is totally acceptable. Our motor burn oil for 2 reasons, flat 6 design as well as being turbocharged.

all flat motor because of how they work and how they are oiled but more oil than a v or i motor would.

secondly the turbos always leak a little oil under high load.

anyone that has tracked any car in their life knows that going through a quart of oil on a weekend on track it totally normal. Porsche, vette, viper, evo, Sti. Mustang, camaro etc. High rpm, high temps, and high load burned oil. On lots of stuff it goes back into the intake to where a catch can is needed. Seen guys fill up 1/4 of a quart in a catch can in 1 30-40 min stint on track.

 

1 quart per 1,000 miles???? Nope!
I drive my car...I have fun in it and change the oil once per year, which is usually about 2,500 to 3,000 miles. I may burn 1/2 a quart if that...again, keep in mind I am having fun in the car.