Grapeseed, almond & jobaba oils are all lighter.

However if your hair isn't high porosity then if you use any oil as a leave-in sealant they are likely to weight your hair down.

Ideally coconut oil should be used as a pre-poo, leaving it on overnight to 13 hours and you should only use the very smallest amount. It should then be washed out with a shampoo or low-poo. The research looks at using a sulphate shampoo to wash it out.