General Information; Fuel Requirements; 6.4L Engine - Jeep Grand Cherokee SRT8 2012 Owner's Manual

General Information

This device complies with part 15 of the FCC rules and
RSS 210 of Industry Canada. Operation is subject to the
following conditions:
• This device may not cause harmful interference.
• This device must accept any interference received,
including interference that may cause undesired
operation.
The tire pressure sensors are covered under one of the
following licenses:
United States . . . . . . . . . . . . . . . . . . . MRXC4W4MA4
Canada . . . . . . . . . . . . . . . . . . . . . 2546A-C4W4MA4
STARTING AND OPERATING 435

FUEL REQUIREMENTS

6.4L Engine

The 6.4L engine is designed to meet all
emissions regulations and provide excel-
lent fuel economy and performance when
using high-quality premium unleaded
gasoline with an octane rating of 91 or
higher.
Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required. Poor quality gasoline can cause problems such
as hard starting, stalling, and hesitations. If you experi-
ence these symptoms, try another brand of gasoline
before considering service for the vehicle.
Over 40 auto manufacturers worldwide have issued and
endorsed consistent gasoline specifications (the World-
wide Fuel Charter, WWFC) which define fuel properties
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