I believe it means not to be used in an internal combustion engine.
Here is definition for fuel oil:
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"non-motor fuel oil" means a light fuel oil marketed or sold for a use other than

(a) for generating power by means of an internal combustion engine, or
(b) for use in a furnace, boiler or open flame burner;
http://www.bclaws.ca/civix/document/id/consol26/consol26/00_...

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Note added at 43 mins (2016-10-12 21:45:22 GMT)
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FUELS TAX DIVISION-MOTOR FUEL (GASOLINE) TAX LAW

Motor fuel" means (a) all products commonly or commercially known or sold as gasoline including natural, absorption, casinghead and drip gasolines, regardless of their classification or uses; and (b) any liquid prepared,
advertised, offered for sale or sold for use as or commonly and commercially
used as a fuel in propelling motor vehicles,

http://aixtcp.cpa.state.tx.us/opendocs/open09/0334a01s.html

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Note added at 14 hrs (2016-10-13 11:15:50 GMT)
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