How soon after service would oil need changing

[hungledink]

Hi there. Bought a 2015 1.5tdci focus in march. It had 55000 when purchased. 

I've done around 1400 miles in it since march, mainly short trips and I haven't really been driving aggressively. Today It's advised it needs an oil change  Was advised it would have a service before I picked it up which should have included the oil change. 

Would it need it doing again so soon?

[Milkman]

Remove the dipstick and see what colour the oil is, if it is a medium dark honey colour leave it, if it is black change it. Have you got the service book for the car?

[iantt]

you need to have proof the service was done. the 1.5 tdci doesnt like short / low milage journeys. if in any doubt that oil wasnt changed then i would seriously consider oil change. engine damage can ocour if oil has been diluted with failed dpf regens.