The make youre own type will indeed have the smell of the oil remaining, but it's not horrendous, the commercially available stuff has chemicals added to clear this, and it is heated as well in production which helps.
I used bio for years from the pumps, ace stuff, some of the earlier strong mixes caused so much tarnish to be removed from where the diesel fuel had stained that it blocked pipes etc.
The bio at the pumps is only 5% bio, brand new engines can be run on 100% bio, as have no tarnish etc.
tabetha