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I have 84,000 miles on my 996. Triple digit temp location. All original. Mobil 1 0W-40 is all I have used. OK so far. Every 6k miles. I cut open the filter and have not seen anything but nice looking oil.
It's a 100 bucks a pop if you do it yourself. I know Porsche says to change it at higher intervals but I still change it about once a year, which is about 6k miles.
I don't know where the oil goes but I keep it topped off and that is about 1 quart between oil changes. They use oil and it doesn't come out of the exhaust pipes.
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