Hi, Any advise is appreciated. After 1 hour drive on the motorway I came to my first stop on the junction. When moving off, the car jerked as if the first gear failed to engage, then immediatly within 1 second it was fine. This happened for 5/6 more times and then stopped. On the way back, Came onto the motorway and then I realise the car is stuck at 3rd gear and will not change to 4th. I stopped at the next service station for 10 minutes, and after that it was fine. 2 Days later the dashboard gearbox light is on. 1. Is it a sign that the gearbox oil needs changing. 2. Some electronic sensor is playing up. 3. Time to have the whole gearbox looked at no matter what the cost! Thanks for your suggestions.