The battle to win a digital slice of the $150 billion auto repair marketplace heated up a little today as RepairPal announced a new $4 million round, adding to $3 million it previously raised. The round was led by Tugboat Ventures and includes several individual investors.

RepairPal focuses on providing leads to repair shops and expert information to consumers. It competes against DriverSide, which raised $5.3 million last March, as well as several regional players, most of which provide static, non-personalized information.

CEO David Sturtz tells us that the site is now getting a million visitors per month between its destination site, its partner sites, its mobile applications and partnerships with Cars.com, AOL Autos, Belo Interactive, AutoNation, AAA of California and others. “This funding will allow us to grow every aspect of our business,” he says.

Sturtz adds that RepairPal’s database can generate more than 70 billion individual ‘RepairPrice’ estimates and the company now has close to 1,000 shops and dealers subscribing to its lead generation product, AppointmentsPlus.