lau

My car had been out in the sun all day when this happened. Was driving out my drive, felt a little 'shaky'to drive, especially at lower revs, but seemed okay. I only just got the car (less than a week ago) and I've driven it three times so I thought it might just be me, as it's sort of done that before when I've reversed and didn't seem to rev enough). After 20 seconds, the engine auto-diagnosis light came on. I pulled over soon after, turned the car on and off and it stayed on. Fortunately I was only taking someone for a quick ride to show them my car so I turned around and went home. As I was driving home (and this was a minute or two of driving) the water temperature light shot up from zero bars to one bar to three bars (it skipped the second bar altogether). What could the problem be? Also some quick points: Car is 53 reg and I'm second ownerWhen I brought it it was fully service,had been recently MOTed and had the cam belt replacedIt has 107k on the clockOil/water levels were fineI noticed there was something that looked like oil on parts of the engine assembly, but it could have been melted grease? (there were no drips on the floor)Is it something that might go away? Or should I take it back to my dealer? It came with a month warranty, but the garage is 40 mins drive away and if it's a serious problem I don't know if it will make it