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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
  
  


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