As long as a light duty oil is used (0,5, or 10W - 20,30, or 40) that is appropriate for your local wheather, the Zetec will do alright. Just make sure its synthetic.
I use to run 5W-30 year round.
All my oil analysis results have come back looking great regardless of oil weight (always used Mobil 1).

Frank McCoy aka Mod-deth aka Mid Life Crisis aka SVT Doood aka mcgainer is a SCAM ARTIST Pre98 Zetec - Some Mods