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I don't see how the overboost code could be related to the oil cooler which seems to be working perfectly. Make sure the engine oil reads full. While the oil cooler and piping have a larger capacity, it may not all drain when changing oil, so the 6.5L may be correct, but always verify full before driving.
The code you are getting seems to be a coincidence. Have you taken logs while at the track to send to your tuner? That would be the next best step.
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1M track toy mods: BMS chargepipe, BMS OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
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