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I had the bearing go on my Legacy RS and the noise was there all the time, albeit noisier when cold. Sounded like a diesel when started first thing in the morning.
Maybe worth trying a change to thicker oil or use this Engine and Gear Oil Additives and Supplements - Molyslip Atlantic Limited.
I've heard a few old Legacy engines with this in them and it does dull the knocking. Maybe just enough to sell it..............