How important is a full service history when selling a car?

How important is a full service history when selling a low mileage car?

Are differential failures common on the Hyundai Santa Fe?

Just been told by my local garage that the rear diff on my car has failed and needs replacing. The car was last serviced one month ago but not by a Hyundai dealership. Being a 2017 model it is just out...

Air conditioning

Audi recommends servicing the air conditioning at 2 years old for £80 Is this good advice ? Many thanks

Are dealer-only oils any different from those publicly available?

I just received my car back from its first dealer service and saw I had been charged £60 for 3 litres of Castrol magnatec 5w30 c2 oil. I showed how I could but the same grade myself for less than half...