I recently bought a 2006 Mercedes-Benz E280 CDI. The independent dealer serviced and MoT'd the car prior to sale and supplied a six month warranty. I knew a gearbox oil and filter change was due, so I had the work done with a local specialist. All was well until last night when travelling down a dual carriageway; I went to accelerate and the car juddered violently, lost all power and there was no kick down function. I pulled over, switched it off and on again and all was well. I took the car back to dealer today and they are demanding to speak with the garage that done the oil change. I fear they are going to try and wriggle out of any responsibility because I had the gearbox serviced after the sale. What do you think?