Cng And Lp Fuel System Modifications; Methylcyclopentadienyl Manganese Tricarbonyl (Mmt) In Gasoline; Fuel System Cautions - RAM Commercial CHASSIS CAB 3500 2021 Owner's Manual

CNG A LP F S
ND UEL YSTEM
M
ODIFICATIONS
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 components.
Problems that result from running CNG or LP are
not the responsibility of the manufacturer and
may void or not be covered under the New
Vehicle Limited Warranty.
M
ETHYLCYCLOPENTADIENYL
M T
ANGANESE RICARBONYL
G
ASOLINE
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.
F S
UEL YSTEM
Follow these guidelines to maintain your
vehicle's performance:
The use of leaded gasoline is prohibited by

Federal law. Using leaded gasoline can
(MMT) I
N
impair engine performance and damage
the emissions control system.
An out-of-tune engine or certain fuel or igni-

tion malfunctions can cause the catalytic
converter to overheat. If you notice a
pungent burning odor or some light smoke,
your engine may be out of tune or malfunc-
tioning and may require immediate service.
Contact an authorized dealer for service
assistance.
C
AUTIONS
CAUTION!
(Continued)
TECHNICAL SPECIFICATIONS
CAUTION! (Continued)
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.
435
9