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Does anyone know what the narrow small oil cooler under the front bumper at the bottom cools?have a leak from the passenger side found a diagram online can see the o ring(number 7)that needs replaced but cannot find a part number. Any help would be appreciated.

Listed as an oil cooler. O ring is available N91044502 Price is £41 !!! etka must fooked up !

Yep, engine oil. There is also a standard small VAG Coolant to Oil exchanger bolted to the block right behind the Alternator at the front lower right of the engine. It helps the oil heat faster when cold and then helps keep it cooler when hot.