Should I sell my car with the service light on?

I am wanting to sell my car in the next month but the service light has just come on. Is it worth getting it serviced before selling it?

Considering the concerns over identity theft, is it wise to pass on all the service history when I trade in a car?

I am considering trading in my car. In the past when I sold a car privately I passed on the service history together with bills, records of payments etc. In view of current concerns over identity theft...

Should I buy a used Lexus with a gap in the service history?

Should I buy a 2017 Lexus which has five Lexus dealer services in the record although there's a gap of 3 years? The car is being sold by a Lexus dealer.

Can a dealer offer me less for a p/x after agreeing a price?

I have picked up a new car and dealership agreed price for my part ex. I have had the car nearly two weeks and they have said it looks like the service history has been altered for my old car, not by me...