If oil has been used to package fresh stirfry, it should state it on the ingredients label. I use both fresh and frozen stir fry when cooking as the fresh stuff will not last until I next go shopping.
Tesco frozen value stir fry works out at 3PP for 100g, using info from the label. Most of these points come from the peas it contains.
To be on the safe side I work out the points from the nutritional info and decide where to go from there, more often than not it does turn out to be 0 with the fresh pack stuff.