[H24k]

I have an audi S8 D2 40v Facelift and basically the oil and coolant have mixed and the expansion tank is full of mixed oil and anti freeze,

I have a new oil cooler and the important plastic pipe which is usually culprit, I took off the alloy wheel and cover etc to check if theres any oil leaking and I can see some oil on the oil cooler housing but nowhere else so im pretty sure its oil cooler thats failed as theres no water in the engine etc, no over heating problems!!

I took the car to my local mechanic who does alot of my servicing etc but after looking at it he didnt want to touch it, hes an old school mechanic so more used to doing basic cars,

I was wondering if anyone had used K seal or similar product to try to seal the broken pipe or the oil cooler, im not a mechanic so do not have much knowledge about such things and im not even sure if the plastic pipe carries water or oil?

Im in the enfield north london area EN3, if there are any local mechanics around here how much would it cost average to get it replaced?