"Shell V-Power Nitro+ Unleaded is formulated with powerful cleaning agents designed to protect key fuel system components from gunk and to help remove some existing gunk as you drive.
Shell V-Power Nitro+ Unleaded is also designed to form a protective film on metal surfaces helping prevent corrosion of critical fuel system components
Shell V-Power Nitro+ Unleaded with Friction Modification Technology (FMT) is designed to help reduce friction in critical areas of your engine, helping them turn more freely.
*Actual effects and benefits may vary according to vehicle, age of vehicle, driving conditions and driving style
Actual potential benefits relate to a detergency element which is designed to help clean-up existing deposits in your engine.
Corrosion protection based on laboratory tests carried out according to ASTM D665A."
Nice they use a pic of an M on the webpage
http://www.shell.co.uk/motorist/shel...-unleaded.html