When I first bought Kim - 2.0 cdti - I was coming back from Barnsley and accidentally left it in 5th gear, at 30mph going up hill. She didn't like it. Plus there was a blatant vibration around the 1500 rev mark.
I know I need to replace the lower engine mount, but I found that putting a bottle of fuel injector cleaner into a quarter tank of fuel then filling up, resulted in a noticeably quieter and smoother ride, despite the vibrations.
My thermo hardly ever gets past 8 o'clock too so I'll be looking for a new thermostat.
After treatment of the fuel system I got uphill in 5th at daft mph, dropped to a lower speed to allow other cars to pass, then easily picked back up to daft mph. It made a big difference
