
Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
Service and Maintenance 463
a year and the oil life system must
be reset. Your trained dealer
technician can perform this work.
If the engine oil life system is reset
accidentally, service the vehicle
within 5 000 km/3,000 mi since the
last service. Reset the oil life
system when the oil is changed.
SeeEngine Oil Life System 0372.
Passenger Compartment Air
Filter
The passenger compartment air
filter removes dust, pollen, and
other airborne irritants from outside
air that is pulled into the vehicle.
The filter should be replaced as part
of routine scheduled maintenance.
Inspect the passenger compartment
air filter every 36 000 km/
22,500 miles or two years,
whichever comes first. Replace if
necessary. More frequent
replacement may be needed if the
vehicle is driven in areas with heavy
traffic, areas with poor air quality,
or areas with high dust levels.
Replacement may also be needed if
there is a reduction in air flow,
excessive window fogging, or odors.
Tire Rotation and Required
Services Every 12 000 km/
7,500 mi
Rotate the tires, if recommended for
the vehicle, and perform the
following services. See Tire
Rotation 0422.
. Check engine oil level and oil
life percentage. If needed,
change engine oil and filter, and
reset oil life system. See Engine
Oil 0369 andEngine Oil Life
System 0372.
. Check engine coolant level. See
Engine Coolant 0379.
. Check windshield washer fluid
level. See Washer Fluid 0385.
. Visually inspect windshield wiper
blades for wear, cracking,
or contamination. See Exterior
Care 0452. Replace worn or
damaged wiper blades. See
Wiper Blade
Replacement 0394.
. Check tire inflation pressures.
See Tire Pressure 0416. .
Inspect tire wear. See Tire
Inspection 0422.
. Visually check for fluid leaks.
. Inspect engine air cleaner filter.
See Engine Air Cleaner/
Filter 0377.
. Inspect brake system. See
Exterior Care 0452.
. Visually inspect steering,
suspension, and chassis
components for damaged, loose,
or missing parts or signs of
wear. See Exterior Care 0452.
Lubricate the suspension and
steering components at least
every other oil change.
(If equipped with grease fittings)
. Check restraint system
components. See Safety System
Check 073.
. Visually inspect fuel system for
damage or leaks.
. Visually inspect exhaust system
and nearby heat shields for
loose or damaged parts.
. Lubricate body components. See
Exterior Care 0452.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
470 Service and Maintenance
Lamps
Properly working headlamps,
taillamps, and brake lamps are
important to see and be seen on
the road.
.Signs that the headlamps need
attention include dimming, failure
to light, cracking, or damage.
The brake lamps need to be
checked periodically to ensure
that they light when braking.
. With a multi-point inspection,
your dealer can check the lamps
and note any concerns.
Shocks and Struts
Shocks and struts help aid in control
for a smoother ride.
. Signs of wear may include
steering wheel vibration, bounce/
sway while braking, longer
stopping distance, or uneven
tire wear.
. As part of the multi-point
inspection, trained dealer
technicians can visually inspect
the shocks and struts for signs of leaking, blown seals,
or damage, and can advise
when service is needed.
Tires
Tires need to be properly inflated,
rotated, and balanced. Maintaining
the tires can save money and fuel,
and can reduce the risk of tire
failure.
. Signs that the tires need to be
replaced include three or more
visible treadwear indicators; cord
or fabric showing through the
rubber; cracks or cuts in the
tread or sidewall; or a bulge or
split in the tire.
. Trained dealer technicians can
inspect and recommend the right
tires. Your dealer can also
provide tire/wheel balancing
services to ensure smooth
vehicle operation at all speeds.
Your dealer sells and services
name brand tires.
Vehicle Care
To help keep the vehicle looking like
new, vehicle care products are
available from your dealer. For information on how to clean and
protect the vehicle’s interior and
exterior, see
Interior Care 0457 and
Exterior Care 0452.
Wheel Alignment
Wheel alignment is critical for
ensuring that the tires deliver
optimal wear and performance.
. Signs that the alignment may
need to be adjusted include
pulling, improper vehicle
handling, or unusual tire wear.
. Your dealer has the required
equipment to ensure proper
wheel alignment.
Windshield
For safety, appearance, and the
best viewing, keep the windshield
clean and clear.
. Signs of damage include
scratches, cracks, and chips.
. Trained dealer technicians can
inspect the windshield and
recommend proper replacement
if needed.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
472 Service and Maintenance
Recommended Fluids, Lubricants, and Parts
Recommended Fluids and Lubricants
This maintenance section applies to vehicles with a gasoline engine. If the vehicle has a diesel engine and/or an
Allison Transmission, see the recommended fluids and lubricants section in the Duramax diesel supplement.
Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.Usage Fluid/Lubricant
Engine Oil Engine oil meeting the dexos1™ specification of the proper SAE viscosity
grade. AC Delco dexos1 Synthetic Blend is recommended. See Engine
Oil 0369.
Engine Coolant 50/50 mixture of clean, drinkable water and use only DEX-COOL
®coolant.
See Engine Coolant 0379.
Hydraulic Brake System DOT 3 Hydraulic Brake Fluid (GM Part No. 19299818, in Canada 19299819).
Hydraulic Clutch System DOT 4 Hydraulic Brake Fluid (GM Part No. 19299570, in Canada 19299571).
Windshield Washer Automotive windshield washer fluid that meets regional freeze protection requirements.
Hydraulic Power Steering System (2500/3500 Series Only) GM Power Steering Fluid (GM Part No. 19329450, in Canada 19329451).
Automatic Transmission (All except 6.2L with 8-Speed transmission) DEXRON
®-VI Automatic Transmission Fluid.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
Customer Information 495
Give only the necessary information
to police and other parties involved
in the crash.
For emergency towing see
Roadside Assistance Program
0487 orRoadside Assistance
Program 0490.
Gather the following information:
. Driver name, address, and
telephone number.
. Driver license number.
. Owner name, address, and
telephone number.
. Vehicle license plate number.
. Vehicle make, model, and
model year.
. Vehicle Identification
Number (VIN).
. Insurance company and policy
number.
. General description of the
damage to the other vehicle.
Choose a reputable repair facility
that uses quality replacement parts.
See “Collision Parts” earlier in this
section. If the airbag has inflated, see
What
Will You See after an Airbag
Inflates? 079.
Managing the Vehicle Damage
Repair Process
In the event that the vehicle requires
damage repairs, GM recommends
that you take an active role in its
repair. If you have a pre-determined
repair facility of choice, take the
vehicle there, or have it towed there.
Specify to the facility that any
required replacement collision parts
be original equipment parts, either
new Genuine GM parts or recycled
original GM parts. Remember,
recycled parts will not be covered by
the GM vehicle warranty.
Insurance pays the bill for the repair,
but you must live with the repair.
Depending on your policy limits,
your insurance company may
initially value the repair using
aftermarket parts. Discuss this with
the repair professional, and insist on
Genuine GM parts. Remember,
if the vehicle is leased, you may be
obligated to have the vehicle repaired with Genuine GM parts,
even if your insurance coverage
does not pay the full cost.
If another party's insurance
company is paying for the repairs,
you are not obligated to accept a
repair valuation based on that
insurance company's collision policy
repair limits, as you have no
contractual limits with that company.
In such cases, you can have control
of the repair and parts choices as
long as the cost stays within
reasonable limits.
Service Publications
Ordering Information
Service Manuals
Service Manuals have the diagnosis
and repair information on the
engines, transmission, axle,
suspension, brakes, electrical,
steering, body, etc.
Service Bulletins
Service Bulletins give additional
technical service information
needed to knowledgeably service

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
524 Index
Exit Lighting . . . . . . . . . . . . . . . . . . . . 186
Extender, Safety Belt . . . . . . . . . . . . 72
Exterior Lamp Controls . . . . . . . . . 178
Exterior Lamps Off Reminder . . . 180
F
FanEngine . . . . . . . . . . . . . . . . . . . . . . . . 384
Fast Idle System . . . . . . . . . . . . . . . . 283
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . 13
Filter,
Engine Air Cleaner . . . . . . . . . . . 377
Fixed Mast Antenna . . . . . . . . . . . . 203
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 181
Flashers, Hazard Warning . . . . . . 182
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 431 Changing . . . . . . . . . . . . . . . . . . . . . 432
FlexFuel E85 . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Floor Console Storage . . . . . . . . . . 121
Floor Mats . . . . . . . . . . . . . . . . . . . . . . 460
Fluid
AutomaticTransmission . . . . . . . . . . . 373, 376
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 387
Four-Wheel Drive
Transfer Case . . . . . . . . . . . . . . . 297
Power Steering . . . . . . . . . . . . . . . 385 Fluid (cont'd)
Washer . . . . . . . . . . . . . . . . . . . . . . . 385
Fog Lamps Bulb Replacement . . . . . . . 183, 396
Folding Mirrors . . . . . . . . . . . . . . . . . . 49
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . 317
Four-Wheel Drive . . . . . . . . . . 297, 389
Four-Wheel-Drive Light . . . . . . . . . 145
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . 496
Front Axle . . . . . . . . . . . . . . . . . . . . . . 390
Front Fog Lamp Light . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Front Seats Adjustment . . . . . . . . . . . . . . . . . . . . . 59
Heated and Ventilated . . . . . . . . . . 63
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Additives . . . . . . . . . . . . . . . . . . . . . 324
Economy Driving . . . . . . . . . . . . . . . 32
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . 327
Filling the Tank . . . . . . . . . . . . . . . 325
Foreign Countries . . . . . . . . . . . . 324
Gauge . . . . . . . . . . . . . . . . . . . . . . . . 135
Low Fuel Warning Light . . . . . . . 148
Management, Active . . . . . . . . . . 288
Requirements, California . . . . . 323 Fuel (cont'd)
System Messages . . . . . . . . . . . . 158
Full-Size Spare Tire . . . . . . . . . . . . 441
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . 400 Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 400
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . 403, 405
G
Garage Door Opener . . . . . . . . . . . 172Programming . . . . . . . . . . . . 172, 175
Gauges Engine Coolant
Temperature . . . . . . . . . . . . . . . . 137
Engine Oil Pressure . . . . . . . . . . 136
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Odometer . . . . . . . . . . . . . . . . . . . . . 135
Speedometer . . . . . . . . . . . . . . . . . 135
Tachometer . . . . . . . . . . . . . . . . . . . 135
Trip Odometer . . . . . . . . . . . . . . . . 135
Voltmeter . . . . . . . . . . . . . . . . . . . . . 138
Warning Lights and Indicators . . . . . . . . . . . . . . . . . . . 131
General Information Service and Maintenance . . . . . 461
Towing . . . . . . . . . . . . . . . . . . . . . . . . 327
Vehicle Care . . . . . . . . . . . . . . . . . . 361
Glass Replacement . . . . . . . . . . . . . 395

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
Index 525
Glove Box . . . . . . . . . . . . . . . . . . . . . . 119
GM Mobility ReimbursementProgram . . . . . . . . . . . . . . . . . . . . . . . 487
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . 395
Hazard Warning Flashers . . . . . . . 182
Head Restraints . . . . . . . . . . . . . . . . . 58
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . 395
Automatic . . . . . . . . . . . . . . . . . . . . . 181
Bulb Replacement . . . . . . . . . . . . 395
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . . 181
Flash-to-Pass . . . . . . . . . . . . . . . . . 181
Headlamps, Front Turn Signal, Sidemarker, and
Parking Lamps . . . . . . . . . . . . . . 396
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . 395
High-Beam On Light . . . . . . . . . . 149
High/Low Beam Changer . . . . . 180
Lamps On Reminder . . . . . . . . . 149
Heated Steering Wheel . . . . . . . . . . . . . . . 126
Heated and Ventilated Front
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Heated Mirrors . . . . . . . . . . . . . . . . . . . 50 Heater
Engine Coolant . . . . . . . . . . . . . . . 285
Heating and Air Conditioning . . . . . . . . . . . . . . 250, 252
High Voltage Devices and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 399
High-Beam On Light . . . . . . . . . . . . 149
High-Speed Operation . . . . . . . . . . 417
Hill and Mountain Roads . . . . . . . . 269
Hill Descent Control (HDC) . . . . . 310
Hill Descent Control Light . . . . . . . 146
Hill Start Assist (HSA) . . . . . . . . . . 307
Home Page . . . . . . . . . . . . . . . . 194, 196
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
How to Wear Safety Belts
Properly . . . . . . . . . . . . . . . . . . . . . . . . 68
Hydraulic Clutch . . . . . . . . . . . . . . . . 376
I
Idle System Fast . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Ignition Positions . . . . . . . . . . . . . . . 281
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . . . . 393
Immobilizer . . . . . . . . . . . . . . . . . . . . . . 46
Indicator
Vehicle Ahead . . . . . . . . . . . . . . . . 147 Infants and Young Children,
Restraints . . . . . . . . . . . . . . . . . . . . . . 90
Infotainment . . . . . . . . . . . . . . . . . . . . 189
Infotainment System . . . . . . . . . . . . 499
Instrument Cluster . . . . . . . . . . . . . . 132
Instrument Panel Storage Area . . . . . . . . . . . . . . . . . .119
Interior Rearview Mirrors . . . . . . . . . 51
Internet Radio Pandora . . . . . . . . . . . . . . . . . . . . . . 204
Introduction . . . . . . . . . . . . . . . . . . . . . . . 2
J
Jack
Auxiliary . . . . . . . . . . . . . . . . . . . . . . 213
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . . . 442
K
Key and Lock Messages . . . . . . . . 158
Keyless EntryRemote (RKE) System . . . . . . . . . 36
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
L
Labeling, Tire Sidewall . . . . . . . . . . 409
Lamps Auxiliary Roof
Mounted Lamp . . . . . . . . . . . . . . 184
Cargo . . . . . . . . . . . . . . . . . . . . . . . . . 185

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9159338) - 2016 - crc - 10/21/15
Index 527
Manual Transmission . . . . . . . . . . . 296Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Manual Windows . . . . . . . . . . . . . . . . 52
Memory Features . . . . . . . . . . . . . . . . 13
Memory Seats . . . . . . . . . . . . . . . . . . . 62
Messages Airbag System . . . . . . . . . . . . . . . . 160
Battery Voltage and
Charging . . . . . . . . . . . . . . . . . . . . 155
Brake System . . . . . . . . . . . . . . . . 156
Compass . . . . . . . . . . . . . . . . . . . . . 156
Door Ajar . . . . . . . . . . . . . . . . . . . . . 156
Engine Cooling System . . . . . . . 156
Engine Oil . . . . . . . . . . . . . . . . . . . . 157
Engine Power . . . . . . . . . . . . . . . . 157
Fuel System . . . . . . . . . . . . . . . . . . 158
Key and Lock . . . . . . . . . . . . . . . . . 158
Lamp . . . . . . . . . . . . . . . . . . . . . . . . . 158
Object Detection System . . . . . 158
Ride Control System . . . . . . . . . . 159
Safety Belt . . . . . . . . . . . . . . . . . . . . 160
Security . . . . . . . . . . . . . . . . . . . . . . 161
Steering System . . . . . . . . . . . . . . 161
Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Transmission . . . . . . . . . . . . . . . . . 162
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 155
Vehicle Reminder . . . . . . . . . . . . . 164
Vehicle Speed . . . . . . . . . . . . . . . . 164 Messages (cont'd)
Washer Fluid . . . . . . . . . . . . . . . . . 165
Mirrors Automatic Dimming . . . . . . . . . . . . . 50
Automatic Dimming
Rearview . . . . . . . . . . . . . . . . . . . . . . 52
Blind Spot . . . . . . . . . . . . . . . . . . . . . . 50
Convex . . . . . . . . . . . . . . . . . . . . . . . . . 47
Folding . . . . . . . . . . . . . . . . . . . . . . . . . 49
Heated . . . . . . . . . . . . . . . . . . . . . . . . . 50
Manual . . . . . . . . . . . . . . . . . . . . . . . . . 47
Manual Rearview . . . . . . . . . . . . . . . 51
Power . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Tilt in Reverse . . . . . . . . . . . . . . . . . . 51
Trailer Tow . . . . . . . . . . . . . . . . . . . . . . 48
Mirrors, Interior Rearview . . . . . . . . 51
Monitor System, Tire Pressure . . . . . . . . . . . . . . . . . . . . . . 417
Multi-band Antenna . . . . . . . . . . . . . 203
N
Navigation OnStar®. . . . . . . . . . . . . . . . . 503, 504
New Vehicle Break-In . . . . . . . . . . . 280
Noise Control System . . . . . . . . . . 392
O
Object Detection System
Messages . . . . . . . . . . . . . . . . . . . . . 158
Odometer . . . . . . . . . . . . . . . . . . . . . . . 135 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Off-Road . . . . . . . . . . . . . . . . . . . . . . . 264 Driving . . . . . . . . . . . . . . . . . . . . . . . . 264
Recovery . . . . . . . . . . . . . . . . . . . . . 263
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . 369
Engine Oil Life System . . . . . . . 372
Engine Oil Pressure Gauge . . . 136
Messages . . . . . . . . . . . . . . . . . . . . 157
Older Children, Restraints . . . . . . . 89
Online Owner Center . . . . . . . . . . . 486
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . 499
OnStar
®Additional
Information . . . . . . . . . . . . . . . 507, 512
OnStar
®Connections . . . . . . . . . . . 505
OnStar®Diagnostics . . . . . . . . . . . . 507
OnStar®Emergency . . . . . . . . . . . . 502
OnStar®Navigation . . . . . . . . 503, 504
OnStar®Overview . . . . . . . . . 500, 501
OnStar®Security . . . . . . . . . . 502, 503
Operating Mode Overheated EngineProtection . . . . . . . . . . . . . . . . . . . 384

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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528 Index
OrderingService Publications . . . . . . . . . . 495
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . 128
Overheated Engine Protection Operating Mode . . . . 384
Overheating, Engine . . . . . . . . . . . . 382
Overview . . . . . . . . . . . . . . . . . . 189, 193
P
Pandora Internet Radio . . . . . . . . . 204
Park
Shifting Into . . . . . . . . . . . . . . . . . . . 286
Shifting Out of . . . . . . . . . . . . . . . . 287
Parking . . . . . . . . . . . . . . . . . . . . . . . . . 288 Brake . . . . . . . . . . . . . . . . . . . . . . . . . 306
Brake and P (Park)Mechanism Check . . . . . . . . . . 394
Over Things That Burn . . . . . . . 288
Parking or Backing Assistance Systems . . . . . . . . . . 314
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . 141
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Passenger Sensing System . . . . . 82
Perchlorate Materials
Requirements, California . . . . . . 362 Personalization
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 165
Phone Apple CarPlay andAndroid Auto . . . . . . . . . . . . . . . . 236
Bluetooth . . . . . . . . 222, 223, 227, 232
Pickup Conversion to
Chassis Cab . . . . . . . . . . . . . . . . . . 359
Pictures and Movies . . . . . . . . . . . . . .237, 241, 242
Port USB . . . . . . . . . . . . . . . . . . . . . 209, 212
Power Door Locks . . . . . . . . . . . . . . . . . . . . . 40
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Outlets . . . . . . . . . . . . . . . . . . . . . . . 128
Protection, Battery . . . . . . . . . . . . 187
Retained Accessory (RAP) . . . 284
Seat Adjustment . . . . . . . . . . . . . . . . 60
Steering Fluid . . . . . . . . . . . . . . . . . 385
Windows . . . . . . . . . . . . . . . . . . . . . . . 52
Power Assist Steps . . . . . . . . . . . . . . 43
Pregnancy, Using Safety Belts . . . 71
Privacy
Vehicle Data Recording . . . . . . . 498
Program
Courtesy Transportation . . . . . . 492 Proposition
65 Warning,
California . . . . . . . . . . . .361, 388, 442
R
Radio Frequency Statement . . . . 496
Radio Reception . . . . . . . . . . . . . . . . 203
Radios
AM-FM Radio . . . . . . . . . . . . 197, 199
Satellite . . . . . . . . . . . . . . . . . . . . . . . 201
Reading Lamps . . . . . . . . . . . . . . . . . 185
Rear Axle . . . . . . . . . . . . . . . . . . . . . . . 390 Locking . . . . . . . . . . . . . . . . . . . . . . . .311
Rear Seats . . . . . . . . . . . . . . . . . . . . . . 65
Rear Windows . . . . . . . . . . . . . . . . . . . 55
Rearview Mirrors . . . . . . . . . . . . . . . . 51 Automatic Dimming . . . . . . . . . . . . . 52
Reclining Seatbacks . . . . . . . . . . . . . 61
Recognition Voice . . . . . . . . . . . . . . . . . . . . . . . . . 216
Recommended Fluids and
Lubricants . . . . . . . . . . . . . . . . . . . . . 472
Records Maintenance . . . . . . . . . . . . . . . . . . 476
Recreational Vehicle Towing . . . . 447
Reimbursement Program, GM Mobility . . . . . . . . . . . . . . . . . . . 487
Remote Keyless Entry (RKE) System . . . . . . . . . . . . . . . . . . . . . . . . . 36