There are in market many substances that have properties to bleach discolored teeth. Many of substances have oils consistence. It could be able to use for bleach RC treated teeth this kind?
Composite resins usually present minor color alterations after bleaching. What kind of oil substance are you specifically referring to? I´m not familiar with such oil based materials.
Although I have also not come across this product, it seems to me that the Ozone will be replacing the hydrogen peroxide to provide the Oxygen radicals for the bleaching action. If the product is otherwise safe, you could simply try it out and see if it works. For endodontically treated teeth the "walking bleach" has become the standard treatment since its introduction in the 1960ies. A more recent description you will find in the attachment.
First off Ozone is no a material known for bleaching organically based materials. Secondly, coating the surface and the exposed dentinal tubules with a vegetable oil as in internal "walking" bleaching of RC teeth would not allow for penetration of the "oxygen" to allow for the removal of the blood/blood "water soluble" products responsible for the discoloration of the teeth. Stick to the walking bleaches that have worked for 50+ years with a clinically proven track record.