Yes Darrenlass your right.....should have said that certain oils are not suitable for high temp as they burn easily. Using groundnut I find it can be heated to a pretty high temp without spoiling, thats why I like cooking with it.
As for sesame seed oil, always add towards end of stir-frying otherwise it can give an unpleasant taste, but used just lightly adds such a nutty flavour.
Feel like heating up some oil now and frying the most delicious Prawn crackers from Korea, called Krupuk Udang, wonderful flavour, beats any served up in the Chinese restaurants.......................Yum Yum!!