Which engine?
You should be ok using 10W40 in all except the EP VTi engines. They take 5W30 or 0W30 according to Haynes.
However my daughter's 1.4 VTi 2008 is a thirsty beast as far as oil is concerned. So we've being using Total Quartz 9000 5W-40 Motor Oil for several years now with no ill effects.
Chicks Fan
October 2017