This 50ml bottle treats 250 Liters of fuel. Suitable for 5 full tanks of fuel on small / regular sized cars. This 50ml bottle treats 250 Liters of fuel. Suitable for 5 full tanks of fuel on small / regular sized cars. Fuel treatment for the 21st century Independent tests performed on a number of engines around the world have confirmed that Oxytane has a dramatic and positive effect on engine fuel economy, emissions and performance. Improves performance Improves fuel economy Reduces engine noise Reduces engine vibration Reduces toxic emissions Improves engine life Reduces carbon deposition in the combustion chamber