Sorry we are closed to at least May 15th. Founded in 1978 and headquartered in Denver, Colorado, the Grease Monkey brand currently operates more than 300 centers internationally with operations in Mexico, China, Colombia and Saudi Arabia. Grease Monkey is the nation's largest independent franchisor of automotive oil change centers with 18+ new locations opening in 2019. Grease Monkey International is the nation's largest independent franchisor of automotive oil change centers serving more than 2 million customers each year.