CSF AUDI S3 QUADRUPLE PASS DSG COOLER (FITS LEFT & RIGHT SIDE) MQB
The cooling ineffectiveness of the DSG Cooler can be explained after examining the stock cooling system design.
The factory coolant routes out of the engine block, into a Y-piece where it splits into the engine water radiator and then into the DSG cooler. This DSG Cooler is surprisingly small and does not have the size or efficiency to exchange heat before it exits the cooler and routes to the DSG oil/water heat exchanger.
If the engine coolant is hot and the DSG oil is hot, which is the case when driving cars with a higher output than stock, spirited or track use, this hot coolant now has little to no cooling effect on the DSG oil and DSG temperatures begin to rise