The total investment to open a Grease Monkey franchise ranges from $156,695 to $347,850 with a $35,000 franchise fee and a 5% royalty. Potential candidates are asked to meet the following financial requirements: a minimum $250,000 net worth and $60,000 in liquid capital, per unit developed. With more than 275 million vehicles on the road, the earnings of the oil industry is estimated at approximately $6 billion annually.