Macholmes07

Recently changed oil cooler on my 2015 s3 along with the seal (I did accidentally snap a bolt putting the cooler back on) But still getting oil coming up to the expansion tank what could it be 🤔🤔 Have been told my waterpump/ thermostat is leaking, could it be this also? Audi have said its unlikely the headgasket as the ea888 is a pretty bulletproof engine