Found this re grapeseed oil:
"The oil itself has a very high level of antioxidant vitamin E (60-120 mg/100 g), which makes it very stable. Most importantly, grapeseed oil is one of the lowest in saturated and one of the highest in the essential fatty acid, linoleic acid, also known as omega 6. Linoleic acid is one of the essential fatty acids which the human body cannot manufacture and must be eaten in order to acquire it. Studies indicate that linoleic acid is sadly deficient in most people's diets, which makes grapeseed oil stand out, containing approximately 76% linoleic acid!"