
Originally Posted by
IanD
I've filled up with Shell V Power premium diesel twice recently. Reason being we lost engine power on the motorway on the way to the Norwich match. The engine had been stuttering before that. It looked like the auto stop/start light was flickering on and off. RAC could find no fault codes, followed us to the services, no further issues as the car restarted no problem. The suggestion was the exhahaust gas valve was sticking. So, tried additives to clean engine/ full carbon clean and premium diesel. Didn't work. Car still stuttering at roundabouts in particular. Had to return home and abandoned the trip to Stoke home match before getting on to the M5. Took the car to a local garage. Short version...not the auto start/stop. It was the (similar) traction control light flickering on and off. Two new sensors/two new rear axles and car is running fine. Still on the second tank of premium diesel and yes am getting more mpg. Engine is running very smooth. But, is extra cost of premium worth the small gain in mpg? Throw in two new (non corroded) rear axles and the picture is less clear. My thought now is maybe to fill up every 4th fill with premium to kero engine running cleaner.