From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Advertisement leaflet for ZOL'S, a petrol-saving additive for motorists.
| Identifier | ExFiles\Box 20\6\ Scan036 | |
| Date | 27th September 1920 | |
| ZOL'S THE GREAT PETROL SAVER. MOTORISTS Once you have used ZOL you will always use it. If you want to save Petrol and get more MILES, more POWER, steady running, easy starting, and drive on more AIR, Then use only ZOL in your Motor Spirit. WHAT ZOL USERS SAY. Owner of Hupmobile—5 more miles to the gallon. Owner of Heavy Lorry—more power on less Petrol. Taxi Driver (Belsize)—easy starting, more miles. My old Darracq takes hills better with ZOL and air. B.S.A. owner writes—absolutely genuine. A Motor Cyclist writes—I get more miles on full air, using less Petrol, no sediment, no special device, just drop a ZOL in ZOL can be used in any Motor Spirit. SOLD BY Wd.{Mr Wood/Mr Whitehead} 27 SEP 1920 RECEIVED | ||