oil warning display on '09' citreon relay?

when turning on ignition,the word 'OIL' is displayed briefly with 5 circles above it,before changing to 'mileage travelled'.
now on start up,an audible 'beep' is heard when the word 'OIL' is displayed and there are 5 lines showing instead of the circles.
the van has only done 6500 mile and the oil level/viscosity are fine.
No other warning indicators appear and van runs fine.
Any ideas??