A fuel additive has been developed by Liqui Moly to protect diesel particulate filters and is designed to be used before fuelling every 1,250 miles. The 250ml can treats 50 to 70 litres of fuel and is suitable for all vehicles fitted with a DPF unless they have an electronically additive tank system, as is the case with Citroen and Peugeot vehicles. "This additive is a practical new service for garages that can save their customers a great deal of expense," explains Liqui Moly spokesman Schönfelder. "And this will show competence to boot, which strengthens the relationship with the customer."