Engine oil viscosity and vehicle fuel consumption

A SUBSTANTIAL proportion of the expenditure involved in running a motor vehicle is attributable to the cost of the fuel which it uses. So far as Great Britain is concerned the great bulk of this fuel has to be imported. Moreover, due mainly to the imposition of further taxation, its cost to the user has recently increased by about 40 per cent in the case of petrol and 45 per cent for road diesel fuel. There is therefore every incentive to economise in the use of motor fuels.