GASOLINE
The typical Octane number ratings for regular grade gasoline (March 1967).
Motor Method 86.2 Octane Number
Research Method 94.2 Octane Number
Average 90.2 Octane Number
These two Octane ratings are used to define the anti-knock quality of gasoline. It
has become common practice in the Petroleum Industry to refer only to the RESEARCH
METHOD RATING although in the United States the average of the two figures is posted
on gasoline pumps.
When only one Octane rating is given for gasoline and the rating method is not
specified,
it can be assumed to be the average rating in the United States or the Research
Method Rating elsewhere in the World.
Engines used in Case Riding Lawn Mowers are designed to operate on REGULAR
GRADE gasoline having a minimum research method rating of 90.7 Octane. This will give
full power and economy together with long engine life and low maintenance cost.
Non-leaded gas is a suitable alternative for use in all 4-cycle air cooled engines used on
Case Riding Lawn Mowers provided the Average Octane Rating in the United States and
the Research Method Octane Rating elsewhere in the World is 90 or higher.
CAUTION:
Hanfllc gasoline with car.' it is highly flammable.
a. Use approved gasoline cotitainer.
b.
Never remove the cap of the fuel tank or add gasoline to a
running or hot engine, or fill the fuel tank indoors. Wirie up
spilled gasoline.
c. 0[)en doors if the engine is run in the garage — exhaust
fumes aie dangerous. Do not run the eng ne' (motor) in-
doors.
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