That is very odd. I have the same year 2009, 6mt, and I literally have no loss from year to year. Granted, I do only 3000 miles a year, but I go for track days, but still I don't need to top up any oil from change to change.
I wanted to suggest either gaskets or oil cooler, but as you have both OK, then I have no idea.
How did you achieve that whp though? Any other mods you got?
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