Actually 8.6 secs per day is not too shabby for a non COSC mechanical watch. Oris consider something silly like 30 secs per day as acceptable. If the variance bugs you then you could have it regulated by a watchmaker but be aware that it will cost you, there is no guarantee that things will be better and if you have the work done by anyone other than the Oris service centre of your country it will invalidate your extended Oris warranty if you have registered your BC3 (the extended warranty is only available if you bought from an AD)
Sorry Chumbian, I've been telling fibs. The Oris specs are -5 and +20 secs per day (don't know where I got 30 from - put it down to my age) so if it's loosing 8.6 secs per day it would be outside those specs. To be 100% sure set it then check the time after 5 days wear. If it's definitely loosing time outside of the specs you can then approach the dealer about having it regulated under the warranty.
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