2021 RAM 1500 fuel type

SERVICING AND MAINTENANCE425
(Continued)
and through another hose to the intake
manifold of the engine. This cooling process
enables more efficient burning of fuel resulting
in fewer emissions.
To guarantee optimum performance of the
system, keep the surfaces of the charge air
cooler, condenser and radiator clean and free
of debris. Periodically check the hoses leading
to and from the charge air cooler for cracks or
loose clamps resulting in loss of pressure and
reduced engine performance.
BRAKE SYSTEM
In order to ensure brake system performance,
all brake system components should be
inspected periodically Ú page 395.
Fluid Level Check — Brake Master Cylinder
The fluid level of the brake master cylinder
should be checked whenever the vehicle is
serviced, or immediately if the brake system
warning light is on. If necessary, add fluid to
bring level within the designated marks on the
side of the reservoir of the brake master
cylinder. Be sure to clean the top of the master
cylinder area before removing cap. With disc
brakes, fluid level can be expected to fall as the
brake pads wear. Brake fluid level should be
checked when pads are replaced. If the brake
fluid is abnormally low, check the system for
leaks Úpage 478.
WARNING!
Riding the brakes can lead to brake failure
and possibly a collision. Driving with your foot
resting or riding on the brake pedal can result
in abnormally high brake temperatures,
excessive lining wear, and possible brake
damage. You would not have your full braking
capacity in an emergency.
WARNING!
Use only manufacturer's recommended
brake fluid Ú page 478. Using the wrong
type of brake fluid can severely damage
your brake system and/or impair its perfor -
mance. The proper type of brake fluid for
your vehicle is also identified on the original
factory installed hydraulic master cylinder
reservoir.
To avoid contamination from foreign matter
or moisture, use only new brake fluid or
fluid that has been in a tightly closed
container. Keep the master cylinder reser -
voir cap secured at all times. Brake fluid in
a open container absorbs moisture from
the air resulting in a lower boiling point. This
may cause it to boil unexpectedly during
hard or prolonged braking, resulting in
sudden brake failure. This could result in a
collision.
Overfilling the brake fluid reservoir can
result in spilling brake fluid on hot engine
parts, causing the brake fluid to catch fire.
Brake fluid can also damage painted and
vinyl surfaces, care should be taken to
avoid its contact with these surfaces.
Do not allow petroleum based fluid to
contaminate the brake fluid. Brake seal
components could be damaged, causing
partial or complete brake failure. This could
result in a collision.
WARNING! (Continued)
8

21_DT_OM_EN_USC_t.book Page 425

450SERVICING AND MAINTENANCE
Safety Both underinflation and overinflation affect the
stability of the vehicle and can produce a feeling
of sluggish response or over responsiveness in
the steering.
NOTE:
Unequal tire pressures from side to side may
cause erratic and unpredictable steering
response.
Unequal tire pressure from side to side may
cause the vehicle to drift left or right.
Fuel Economy
Underinflated tires will increase tire rolling
resistance resulting in higher fuel consumption.
Tread Wear
Improper cold tire inflation pressures can cause
abnormal wear patterns and reduced tread life,
resulting in the need for earlier tire
replacement.
Ride Comfort And Vehicle Stability
Proper tire inflation contributes to a
comfortable ride. Overinflation produces a
jarring and uncomfortable ride.
Tire Inflation Pressures
The proper cold tire inflation pressure is listed
on the driver's side B-Pillar or rear edge of the
driver's side door.
At least once a month:
Check and adjust tire pressure with a good
quality pocket-type pressure gauge. Do not
make a visual judgement when determining
proper inflation. Tires may look properly
inflated even when they are underinflated.
Inspect tires for signs of tire wear or visible
damage.
Inflation pressures specified on the placard are
always “cold tire inflation pressure”. Cold tire
inflation pressure is defined as the tire pressure
after the vehicle has not been driven for at least
three hours, or driven less than 1 mile (1.6 km)
after sitting for a minimum of three hours. The
WARNING!
Improperly inflated tires are dangerous and
can cause collisions.
Underinflation increases tire flexing and
can result in overheating and tire failure.
Overinflation reduces a tire's ability to
cushion shock. Objects on the road and
chuckholes can cause damage that result
in tire failure.
Overinflated or underinflated tires can
affect vehicle handling and can fail
suddenly, resulting in loss of vehicle
control.
Unequal tire pressures can cause steering
problems. You could lose control of your
vehicle.
Unequal tire pressures from one side of the
vehicle to the other can cause the vehicle
to drift to the right or left.
Always drive with each tire inflated to the
recommended cold tire inflation pressure.
CAUTION!
After inspecting or adjusting the tire pressure,
always reinstall the valve stem cap. This will
prevent moisture and dirt from entering the
valve stem, which could damage the valve
stem.

21_DT_OM_EN_USC_t.book Page 450

483
INDEX
A
Adaptive Cruise Control (ACC) (Cruise
Control)
................................................ 177, 179Adding Engine Coolant (Antifreeze)............... 422Adding Fuel.......................................... 208, 210Additives, Fuel............................................... 469AdjustDown........................................................... 36Forward....................................................... 36Rearward..................................................... 36Up................................................................ 36Adjustable Pedals............................................ 43Advance Phone Connectivity......................... 279Air BagAir Bag Operation...................................... 344Air Bag Warning Light...................... 342, 345Enhanced Accident Response......... 353, 394Event Data Recorder (EDR)....................... 394Front Air Bag............................................. 345If Deployment Occurs................................ 352Knee Impact Bolsters................................ 349Maintaining Your Air Bag System.............. 354Maintenance............................................. 354Redundant Air Bag Warning Light.............343Transporting Pets...................................... 369Air Bag Light............................... 126, 342, 369
Air Cleaner, Engine (Engine Air Cleaner
Filter)............................................................ 411Air Conditioner Maintenance........................ 415Air Conditioner Refrigerant........................... 415Air Conditioner System................................. 415Air Conditioning................................................ 63Air Conditioning Filter..............................67, 415Air Conditioning System................................... 65Air Conditioning, Operating Tips....................... 66Air Filter........................................................ 411Air PressureTires......................................................... 450Air Suspension..................................... 165, 169AlarmSecurity Alarm....................................26, 127Alterations/ModificationsVehicle......................................................... 11Antifreeze (Engine Coolant)................. 422, 474Disposal................................................... 423Anti-Lock Brake System (ABS)...................... 310Anti-Lock Warning Light................................ 132Assist, Hill Start............................................. 317Audio Settings............................................... 266Audio Systems (Radio).................................. 236Auto Down Power Windows............................. 78Automatic Door Locks...................................... 30
Automatic Headlights.......................................54Automatic High Beams.....................................53Automatic Tailgate Release.............................85Automatic Temperature Control (ATC)..............65Automatic Transmission....................... 156, 426Adding Fluid.............................................. 426Fluid And Filter Change............................. 426Fluid Change............................................. 426Fluid Level Check...................................... 426Fluid Type........................................ 426, 478Special Additives...................................... 426Automatic Transmission Limp Home Mode... 159AutoPark....................................................... 141AUX Camera......................................... 204, 208Auxiliary Driving Systems.............................. 318Axle Fluid.............................................. 426, 478Axle Lubrication............................................ 426
B
Back-Up......................................................... 202Back-Up Camera........................................... 202Battery................................................. 128, 409Charging System Light.............................. 128Keyless Key Fob Replacement....................18Battery Saver Feature......................................57Belts, Seat.................................................... 369
11

21_DT_OM_EN_USC_t.book Page 483