Composition containing heterocyclic compounds and a method of lubricating an internal combustion engine

A method of lubricating an engine, said method comprising supplying to said engine a lubricating composition comprising:

• a) an oil of lubricating viscosity;
• b) 0.2 to 5 wt % of a heterocycle having a hydrocarbon group containing 6 to 40 carbon atoms and represented by the formula:
• wherein, R12 is a hydrocarbyl group containing 1 to 40 carbon atoms;
• Y is O—R11 or an oxygen anion in conjunction with an amine cation or a metal cation present in an amount sufficient to satisfy the valence of Y;
• and R11 is a hydrocarbyl group containing 1 to 40 carbon atoms, or a hydroxyl alkyl group.