Hi guys, I’ve recently bought an A4 b7 2.0 tdi Quattro special edition 2007, it went into limp mode but once left for a while it starts and drives fine but I noticed oil in the expansion tank and it’s losing about half an inch of water a week , the car drives perfect I’ve had the oil cooler replaced the Egr cooler replaced the cooling system cleaned out but it’s still happening , no coloured smoke from the exhaust, has anyone had a similar issues and how to rectify it cheers