Do you know your hair properties? That is very important in saving you a lot of time with trying different things.
I suspect either you have grapeseed oil that is not pure grapeseed or you simply have a rancid bottle.
Grapeseed oil has protein in it, juanab, that's possibly why it didn't work well for you.
remember, with all advice or suggestions for your hair, YMMV!!
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
LI: KCKT or CJSL
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)
Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.