Cng And Lp Fuel System Modifications; Mmt In Gasoline; Materials Added To Fuel; Fuel System Cautions - Alfa Romeo STELVIO 2021 Owner's Manual

CNG And LP Fuel System Modifications

Modifications that allow the engine to run on
Compressed Natural Gas (CNG) or Liquid
Propane (LP) may result in damage to the
engine, emissions, and fuel system compo-
nents. Problems that result from running CNG
or LP are not the responsibility of the manufac-
turer and may void or not be covered under the
New Vehicle Limited Warranty.

MMT In Gasoline

Methylcyclopentadienyl Manganese Tricar-
bonyl (MMT) is a manganese-containing
metallic additive that is blended into some
gasoline to increase octane. Gasoline blended
with MMT provides no performance advantage
beyond gasoline of the same octane number
without MMT. Gasoline blended with MMT
reduces spark plug life and reduces emissions
system performance in some vehicles. The
manufacturer recommends that gasoline
without MMT be used in your vehicle. The MMT
content of gasoline may not be indicated on
the gasoline pump; therefore, you should ask
your gasoline retailer whether the gasoline
contains MMT. MMT is prohibited in Federal
and California reformulated gasoline.

Materials Added To Fuel

Besides using unleaded gasoline with the
proper octane rating, gasolines that contain
detergents, corrosion and stability additives
are recommended. Using gasolines that have
these additives will help improve fuel
economy, reduce emissions, and maintain
vehicle performance.
Designated TOP TIER Detergent
Gasoline contains a higher level of
detergents to further aide in mini-
mizing engine and fuel system
deposits. When available, the usage of TOP
TIER Detergent Gasoline is recommended.
Visit www.toptiergas.com for a list of TOP TIER
Detergent Gasoline Retailers.
Indiscriminate use of fuel system cleaning
agents should be avoided. Many of these
materials intended for gum and varnish
removal may contain active solvents or similar
ingredients. These can harm fuel system
gasket and diaphragm materials.
www.inhauto.com

Fuel System Cautions

CAUTION!
Follow these guidelines to maintain your
vehicle's performance:
The use of leaded gasoline is prohibited by

Federal law. Using leaded gasoline can
impair engine performance and damage
the emissions control system.
CAUTION! (Continued)
An out-of-tune engine or certain fuel or

ignition malfunctions can cause the cata-
lytic converter to overheat. If you notice a
pungent burning odor or some light
smoke, your engine may be out of tune or
malfunctioning and may require imme-
diate service. Contact an authorized
dealer for service assistance.
The use of fuel additives, which are now

being sold as octane enhancers, is not
recommended. Most of these products
contain high concentrations of methanol.
Fuel system damage or vehicle perfor-
mance problems resulting from the use of
such fuels or additives is not the responsi-
bility of the manufacturer and may void or
not be covered under the New Vehicle
Limited Warranty.
NOTE:
Intentional tampering with the emissions
control system can result in civil penalties
being assessed against you.
(Continued)
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