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I have an 06 WRX with 120k. However the previous owner did oil changes every 3500 miles. The Boxer layout is susceptible to oil starvation which is why Porsche uses 7 qts an oil change. Since Subaru owners will not pay as much for an oil change, you have to change oil more frequently than a conventional car.
Btw the oil I use is Belgian Castrol 0W30. It made the engine much smoother and I plan to use it in the M2.
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