Many people have previously posted about Bio Oil, so if you type it into the search bar here and check the "site" button, you will find lots of opinions.
In my opinion, Bio Oil is ok and works reasonably well on uneven skin tone and minor marks and scars, but it does take months to see any improvement, which is costly. There probably wouldn't be much improvement on serious scar tissue.
It does absorb relatively well, but I think the massaging is quite important too, to break down the scar tissue, but obviously, if it's painful then it could be a problem.