iveco daily 55 reg red flashing oil light with squiggle underneath ?

Hi I have a iveco daily 55 reg (ex parcleforce) no handbook. Started it this morning and was greeted by this red flashing oil light with a squiggly line underneath it. it went out after about 5 mins of driving. I have noticed that there are 2 lights the same both red oil lights but only this one with the squiggly line came on. any suggestions greatly recieved as no hand book - thanks !