Aspen 4 is an effective fuel for different types of four-stroke engines. Alkylate petrol has been developed in association with commercial users to give the lowest possible environmental impact and a better working environment. Aspen 4 is a purer petrol, free from harmful components such as benzene, lead and toluene. This minimises harmful environmental effects and health risks for the user. The engine is kept cleaner resulting in better efficiency and smoother running.