CHEVROLET 2010 HHR - Manual (Page 300)

If the vehicle has the 2.2L L4 engine (VIN Code B) or
the 2.4L L4 engine (VIN Code V), you can use
either unleaded gasoline or ethanol fuel containing up to
85% ethanol (E85). See Fuel E85 (85% Ethanol) on
page 6-8. If the vehicle has the 2.0L L4 engine
(VIN Code M), use only unleaded gasoline. See
Gasoline Octane on page 6-6.
Gasoline Octane
If the vehicle has the 2.2L L4 engine (VIN Code B), use
regular unleaded gasoline with a posted octane rating
of 87 or higher. If the octane rating is less than 87,
an audible knocking noise, commonly referred to
as spark knock, might be heard when driving. If this
occurs, use a gasoline rated at 87 octane or higher as
soon as possible. If heavy knocking is heard when
using gasoline rated at 87 octane or higher, the engine
needs service.
If the vehicle has the 2.4L L4 engine (VIN Code V) or
the 2.0L L4 engine (VIN Code M), use premium
unleaded gasoline with a posted octane rating of 91 or
higher. You can also use regular unleaded gasoline
rated at 87 octane or higher, but the vehicle’s
acceleration could be slightly reduced, and a slight
audible knocking noise, commonly referred to as spark
knock, might be heard. If the octane is less than 87,
you might notice a heavy knocking noise when
you drive. If this occurs, use a gasoline rated at
87 octane or higher as soon as possible. Otherwise,
you could damage the engine. If heavy knocking
is heard when using gasoline rated at 87 octane or
higher, the engine needs service.
Gasoline Specifications
At a minimum, gasoline should meet ASTM specification
D 4814 in the United States or CAN/CGSB-3.5 or
3.511 in Canada. Some gasolines contain an
octane-enhancing additive called methylcyclopentadienyl
manganese tricarbonyl (MMT). We recommend
against the use of gasolines containing MMT. See
Additives on page 6-7 for additional information.
6-6