I've just in the middle of a major service on my 58 S3 and need to change the Haldex oil. I bought all the parts for the service from my local main dealer and requested the Haldex oil and filter. They supplied me with the oil (in a tin rather than the silicone style tube) and told me that the filter was not required on my model S3. I went to do it today after reading a how-to guide on this forum, however didn't realise that in my car is the new style gen 4 haldex coupling. The coupling and diff seem to be one complete unit. Can anyone please tell me where to drain and refill the oil? Also any special tools needed? Wherever the oil goes I'm thinking it's gonna need a pump to get it in?