§ Sir Dudley Smith
To ask the Secretary of State for the Environment how many grades of unleaded petrol are now marketed; and what guidance is given to drivers as to which grade will not prove harmful to their cars, where these are converted for unleaded petrol use.
§ Mr. Heathcoat-Amory
Two grades of unleaded petrol are being marketed—95 octane "Premium" and 97/98 octane "Super" or "Super Plus". The vast majority of new cars can use 95 octane and from 1 October this year all new cars will be required to be able to do so. Super unleaded is being marketed for a relatively small number of cars that cannot be, or are not, tuned for 95 octane. Any car that is tuned for 95 octane can use the super fuel but will show no advantage for the extra expense. The Department has issued guidance on which existing cars can use 95 octane unleaded, and information is also being disseminated by the motor and petrol trades. Any motorist who does not find unequivocal guidance in his car manual or from one of the other sources should consult his dealer or other qualified person.