After 3 years of owning my mjet sporting it's time to trade in !! Swooping tomorrow for a seat Leon fr tdi, to my surprise the car has decided to run like a bag of nails !! Struggling for power I almost sure it's the egr valve again which was replaced 16 months ago. Cleaned it yesterday seemed ok but after driving it today it's the same, should I tell the dealer tomorrow or just park it up exchange cars and drive away ??