The choice is yours at the end of the day, have you had a quote for the service? You should be informed prior to service by a mazda dealer, well a good one. Also if you have your book look see what gets done at that service interval compared to your last one ( if not ask them ).Then weigh up whats best for your car or your wallet. Im a petrol head so i,ll leave it to the diesel owners to give their point of view because i believe its very important you hear from them. Im due a service next month but low mileage like yourself although ive done 5.5 k mazda allow the service to be pushed back up to a month. My car is 11 months old so still in warrenty.