Say the compression in the cylinder before treatment was 142.2 psi (10 kgf/cm2) and after treatment, it became 184.9 psi (13 kgf/cm2). The manufacturer guarantees that this performance will remain the same for a year at any mileage. In practice, your car can run 60000 miles without loss of improved performance (100 000 km). Then, you can treat your engine again.