The healthiest oil you can use is olive oil. Olive oil is a monounsaturated fat and, unlike butter, lard, and other fats, contains a large proportion of easily digested fats and no cholesterol. Olive oil is also a good source of vitamin E, which is thought to help protect humans against cancer and heart disease. It is now the third best selling oil in the US and getting more and more use because of its properties.
My personal taste says ditto to 'extra virgin' olive oil. Also it's 'burn' temp is 406° as opposed to canola oil which is 400°. Extra light olive oil burn temperature is even higher, 468°. It's regular unrefined olive oil that burns at only 320°.
As for which oil is healthiest, all vegetable oils we cook with contain a combination of saturated, monounsaturated, and polyunsaturated fats in varying degrees so there really is no such thing as a saturated-fat-free oil or one containing only polyunsaturated or monounsaturated fat.
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