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When I had my 09 WRX I use Mobil 1 5w-30 quite often, that or Penzoil Platinum depending on which was cheaper at the time. Changed every 3,750 miles per the owners manual, with plenty of trips to New England Dragway and daily driven in everything from sub zero NH winters to hot summer traffic jams on Hampton beach. I sold the car with just over 40,000 miles on it and in that time it never used a drop of oil. I check my oil level constantly, including right before doing an oil change, and my oil level was always at the full line.
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