Is a verbal agreement enforceable?

Question Details:

My employer bought me a car as a bonus last year. They gave me the money, and the car is in my name and I have the title free and clear. The employer stated that if I was no longer employed there within five years that I would either have to return the car, or make payments to them. I was told that they would draft an agreement for me to review terms and sign. There was never an agreement made or signed. I am no longer employed there, but now my former employer has asked me to return the car and title to them. Is this "verbal agreement" enforceable; there is clearly a disagreement on the terms? Important Notice