100% pure argan oil is the lightest natural oil available. Despite having hair so fine that it would take at least 2 or 3 hairs together to boost it up to a 1 on a fineness to coarseness scale of 1-10, it does not weigh my hair down to use 3-4 drops (applied with slightly damp hands). Nor does it make my low porosity hair greasy.

I have some success doing pre-poo coconut oil treatments using a small amount of oil (about a quarter to half a teaspoon). There is no need to use a sulfate or non-sulphate shampoo to remove excess oil. Co-washing works just fine.
Peace,
Morgan

Baby Fine 3B, low porosity, normal density and elasticity
CGing since July 2008