The following is a list of which ingredients will make which oils. In all cases you must use an Alembic on the the potion to make an infusion, then use Aqua Incanta on the infusion to make the Oil. If you are using peas for the oils you must make sure that you have the Concentrated Aqua Incanta.

Normal Oils
Use Alembic
On Standard Potion
To Produce Infusions
Use Infusion On Aqua Incanta
To Produce Oils

Concentrated Oils
Use Alembic
On Standard Potion
To Produce Infusions
Use Infusion On Concentrated Aqua Incanta
To Produce Concentrated Oils