On our track and street driven car (05 Legacy GT Turbo) we change it about every 7500miles for street miles. When we throw in track days in the summer we reduce it down to 3500-5000 miles. We run Amsoil Full Synthetic and Amsoil Extended Life Oil Filters.
-mike
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'04 Nissan Armada - '11 STi Hatch - '05 Cadillac CTS-V
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