A method of lubricating an internal combustion engine comprising supplying to the internal combustion engine a lubricating composition comprising an oil of lubricating viscosity and a product of any of: a. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate in the presence of a polyether compound; and (b) Neutralising the detergent substrate of step (a) with a metal-containing base to form a neutral metal-containing detergent soap, Or b. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate; (b) Contacting the detergent substrate of step (a) with a polyether compound; thereafter neutralising the detergent substrate with a metal-containing base to form a neutral metal-containing detergent soap, Or c. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate; and (b) Neutralising the detergent substrate of step (a) with a metal-containing base in the presence of a polyether compound to form a neutral metal-containing detergent soap, with the proviso that at least 50 mol % of the polyether compound is added before 75 % of neutralizing is complete, Or d. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate; (b) Neutralizing the detergent substrate of step (a) with a metal-containing base to form a neutral metal-containing detergent soap; and overbasing the neutral metal-containing detergent soap of step (b) to form an overbased detergent, in the presence of a polyether compound, with the proviso that at least 50 mol % of the polyether compound is added before 75 % of overbasing is complete; and wherein the detergent substrate comprises a hydrocarbyl-substituted phenol (typically an alkyl phenol), or a sulphur-bridged alkyl phenol, or a methylene coupled alkyl phenol forming a phenate detergent; and the weight ratio of the detergent substrate to polyether varies from 1:60 to 1:1, or 1:32 to 3:4, or 1:12 to 2:3; and wherein the product is present in the range of 0.01 wt % to 8 wt %, or 0.1 wt % to 6 wt %, or 0.15 wt % to 5 wt %, or 0.2 wt % to 3 wt % of the lubricating composition. a. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate in the presence of a polyether compound; and (b) Neutralising the detergent substrate of step (a) with a metal-containing base to form a neutral metal-containing detergent soap, Or (a) Forming/providing a detergent substrate in the presence of a polyether compound; and (b) Neutralising the detergent substrate of step (a) with a metal-containing base to form a neutral metal-containing detergent soap, b. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate; (b) Contacting the detergent substrate of step (a) with a polyether compound; thereafter neutralising the detergent substrate with a metal-containing base to form a neutral metal-containing detergent soap, Or (a) Forming/providing a detergent substrate; (b) Contacting the detergent substrate of step (a) with a polyether compound; thereafter neutralising the detergent substrate with a metal-containing base to form a neutral metal-containing detergent soap, c. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate; and (b) Neutralising the detergent substrate of step (a) with a metal-containing base in the presence of a polyether compound to form a neutral metal-containing detergent soap, with the proviso that at least 50 mol % of the polyether compound is added before 75 % of neutralizing is complete, Or (a) Forming/providing a detergent substrate; and (b) Neutralising the detergent substrate of step (a) with a metal-containing base in the presence of a polyether compound to form a neutral metal-containing detergent soap, with the proviso that at least 50 mol % of the polyether compound is added before 75 % of neutralizing is complete, d. A process for preparing a metal-containing detergent that has incorporated into it a polyether compound, the process comprising the steps of: (a) Forming/providing a detergent substrate; (b) Neutralizing the detergent substrate of step (a) with a metal-containing base to form a neutral metal-containing detergent soap; and overbasing the neutral metal-containing detergent soap of step (b) to form an overbased detergent, in the presence of a polyether compound, with the proviso that at least 50 mol % of the polyether compound is added before 75 % of overbasing is complete; (a) Forming/providing a detergent substrate; (b) Neutralizing the detergent substrate of step (a) with a metal-containing base to form a neutral metal-containing detergent soap; and overbasing the neutral metal-containing detergent soap of step (b) to form an overbased detergent, in the presence of a polyether compound, with the proviso that at least 50 mol % of the polyether compound is added before 75 % of overbasing is complete;