Thankyou for your replies I take onboard that the service light may come on because the van only does short distances,therefore the oil temperature doesn't reach the ideal operating temp.Ihave spoken to people in the trade ,who do the same work in their vans,they get approximately 8000 miles between services,which seems more reasonable taking everything in consideration.

Forgot to say,the chassis was bought new,it was then converted to an ice cream van.

Thanks for the advise,the garage has updated the soft ware on the computer, but it is still the same.I am going to ask them to do a report and then get intouch with mercedes again.

I recently bought a Mercedes Benz sprinter chassis,to have converted to an ice cream van.It has a computer to advise when a service is due. After 3000 miles the service message came on.The service garage, agree that there is a fault with the computer.However mercedes are refusing to replace the computer unit.They argue that the driving style is the reason the service message is being displayed.I know other ice cream traders with the same van and same driving conditions,most cover 7000 to 9000 miles between services.Any help or advice welcome.