Answer:
Robert cannot successfully sue because he did not rely to his detriment on the promise.
Step-by-step explanation:
Recourse refers to as an individual resort, seeks or ask from courts, other individual, manufacturer of a product, organisation e.t.c for help or protection.
legal recourse on the other hand is a deliberate act (action) undergone by a person, group or a corporation to find a lasting solution to legal difficulty. it comes in form of a lawsuit, Petition or in other ways.
Promissory estoppel can be defined as rule, doctrines or laws that has being laid down to prevents a party from acting indifferently even when the first party promised not to, and the second party fully depend on the promise that was made and has worked towards it but in Robert case, he relied not on the detriment the promise but on his own used car.