1999 CHEVROLET CORVETTE oil temperature

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6-15
Your Corvette engine is filled at the factory with a
Mobil 1
synthetic oil, which meets all requirements for
your vehicle.
Substitute Engine Oil: When adding oil to maintain
engine oil level, oil meeting GM Standard GM4718M
may not be available. You can add substitute oil
designated SAE 5W
-30 with the ªStarburstº symbol at
all temperatures. If temperatures are above 0F (
-18C),
you may substitute SAE 10W
-30 with the ªStarburstº
symbol. Substitute oil not meeting GM Standard
GM4718M should not be used for an oil change.
Engine Oil Additives
Don't add anything to your oil. Your dealer is ready to
advise if you think something should be added.
When to Change Engine Oil
Your vehicle has a computer that lets you know when to
change your engine oil. This is not based on mileage,
but on engine revolutions and engine operating
temperature. When the computer has calculated that the
oil needs changing, the Oil Life Monitor will indicate
that a change is necessary. The mileage between oil
changes will vary depending on how you drive your
vehicle
-- usually between 3,000 miles (5 000 km) and
10,000 miles (16 000 km) since your last oil change.Under severe conditions, the indicator may come on
before 3,000 miles (5 000 km). Never drive your vehicle
more than 10,000 miles (16 000 km) or 12 months
(whichever occurs first) without an oil change. Use
engine oil meeting the GM Standard GM4718M.
The system won't detect dust in the oil. So, if you drive
in a dusty area, be sure to change your oil every
3,000 miles (5 000 km) or sooner if the CHANGE OIL
SOON message comes on. Remember to reset the
Engine Oil Life Monitor whenever the oil is changed.
When Changing the Engine Oil
There is a special procedure for changing engine oil,
contact your dealer for additional information or the
procedure can be found in a Corvette Service Manual.
To purchase a service manual, see ªService and Owner
Publicationsº in the Index.
How to Reset the Engine Oil Life Monitor
To reset the monitor after an oil change:
1. With the ignition on, press the TRIP button so the
OIL LIFE percentage is displayed.
2. Press RESET and hold for two seconds. The word
RESET will appear, then OIL LIFE 99%.

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6-19
Change both the fluid and filter every 50,000 miles
(80 000 km) if the vehicle is mainly driven under one of
these conditions:

In heavy city traffic where the outside temperature
regularly reaches 90F (32C) or higher.

In hilly or mountainous terrain.

High performance operation.
If you do not use your vehicle under one of these
conditions, change the fluid and filter every
100,000 miles (166 000 km).
See ªScheduled Maintenance Servicesº in the Index for
the proper service intervals for the transmission fluid
and filter.
Manual Transmission Fluid
When to Check
A good time to have it checked is when the engine oil is
changed. However, the fluid in your manual
transmission doesn't require changing.
How to Check
Because this operation can be difficult, you may choose
to have this done at your Chevrolet dealership
Service Department.
If you do it yourself, be sure to follow all the
instructions here, or you could get a false reading.
NOTICE:
Too much or too little fluid can damage your
transmission. Too much can mean that some
of the fluid could come out and fall on hot
exhaust system parts, starting a fire. Be sure
to get an accurate reading if you check your
transmission fluid.
Check the fluid level only when your engine is off, the
vehicle is parked on a level place and the transmission is
cool enough for you to rest your fingers on the
transmission case.

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6-23
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a pre
-set temperature.
When you replace the thermostat, a GM thermostat
is recommended.
Engine Coolant
The cooling system in your vehicle is filled with
DEX
-COOL
engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
DEX
-COOL
extended life coolant.
The following explains your cooling system and how
to add coolant when it is low. If you have a problem
with engine overheating, see ªEngine Overheatingº in
the Index.A 50/50 mixture of clean, drinkable water and
DEX
-COOL
coolant will:

Give freezing protection down to
-34F (-37C).

Give boiling protection up to 265F (129C).

Protect against rust and corrosion.

Help keep the proper engine temperature.

Let the warning lights and gages work as
they should.
NOTICE:
When adding coolant, it is important that you
use only DEX
-COOL (silicate-free) coolant.
If coolant other than DEX-COOL is added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
-- at
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the
use of coolant other than DEX
-COOL is not
covered by your new vehicle warranty.

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9-4
Driver Information Center (DIC) Messages (Continued)
Change Oil Now 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Oil Soon 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge System Fault 2-105 . . . . . . . . . . . . . . . . . . . . . . . . .
Competitive Driving 2-103 . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Over Temp 2-107 . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Disengaged 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Set_MPH (_km/h) 2-112 . . . . . . . . . . . . . . . . . . . . . .
Door Ajar 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Protection Reduce Engine RPM 2-112 . . . . . . . . . .
Flat Tire 2-110 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hatch Ajar 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Oil Temperature Reduce Engine rpm 2-107 . . . . . . . .
High Tire Pressure - (LF, LR, RF, RR) 2-111 . . . . . . . . . . .
High Trans Temp 2-108 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Voltage 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Brake Fluid 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Coolant 2-107 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Fuel 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Oil Level 2-104 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Oil Pressure 2-104 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Tire Pressure 2-109 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Voltage 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Washer Fluid 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Speed 80 mph (129 km/h) 2-107 . . . . . . . . . . . .
Pull-Key - Wait 10 Sec 2-104 . . . . . . . . . . . . . . . . . . . . . . .
Reduced Engine Power 2-104 . . . . . . . . . . . . . . . . . . . . . . .
Reserve Fuel 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service ABS 2-103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Active Handling 2-108, 4-11 . . . . . . . . . . . . . . . . .
Service Column Lock 2-104 . . . . . . . . . . . . . . . . . . . . . . . . .
Service Ride Control 2-106 . . . . . . . . . . . . . . . . . . . . . . . . . Service Tire Mon Sys 2
-111 . . . . . . . . . . . . . . . . . . . . . . . . .
Service Traction System 2-106 . . . . . . . . . . . . . . . . . . . . . .
Service Vehicle Soon 2-105 . . . . . . . . . . . . . . . . . . . . . . . . .
Shocks Inoperative 2-106 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trac/Act Hndlg - Off 2-103 . . . . . . . . . . . . . . . . . . . . . . . . .
Trac/Act Hndlg - On 2-102, 4-11 . . . . . . . . . . . . . . . . . . . .
Traction Sys Active 2-105 . . . . . . . . . . . . . . . . . . . . . . . . . .
Traction System - Off 2-106 . . . . . . . . . . . . . . . . . . . . . . . .
Traction System - On 2-105 . . . . . . . . . . . . . . . . . . . . . . . . .
Trunk Ajar 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upshift Now 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warm Up Complete 2-102, 4-10 . . . . . . . . . . . . . . . . . . . . .
Driver Position 1-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
City 4-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Competitive 4-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defensive 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeway 4-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In a Blizzard 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Foreign Countries 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
In the Rain 4-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Night 4-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Curves 4-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Hill and Mountain Roads 4-24 . . . . . . . . . . . . . . . . . . . .
On Snow and Ice 4-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Through Deep Water 4-20 . . . . . . . . . . . . . . . . . . . . . . . . . .
Wet Roads 4-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter 4-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DRL 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunk Driving 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-5
Electrical Equipment, Adding 2-24, 3-28, 6-63 . . . . . . . . . .
Electrical System 6-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Dual Climate Control System 3-4 . . . . . . . . . . . . . .
EMT 6-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Belt 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Coolant 6-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner/Filter 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Coolant 6-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 5-13, 5-16, 6-23 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Heater 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Level Check 7-13 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Gage 2-82 . . . . . . . . . . . . . . . . . . . . .
Exhaust 2-16, 2-38, 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block 6-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identification 6-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Level Check 7-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pressure Gage 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overheated Engine Protection Operating Mode 5-8 . . . . . .
Overheating 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Curves 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Running While Parked 2-39 . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 6-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your 2-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Air Cleaner/Filter 6-16 . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kind to Use 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Level Check 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Life 2-97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Life Monitor, How to Reset 6-15 . . . . . . . . . . . . . . . . . . . . .
Scheduled Maintenance 7-6 . . . . . . . . . . . . . . . . . . . . . . . . . Used 6
-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When to Change 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil Life Monitor 6-15, 7-5 . . . . . . . . . . . . . . . . . . . . .
Engine Oil Scheduled Maintenance 7-6 . . . . . . . . . . . . . . . . . .
English/Metric Button 2-77 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ethanol 6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust, Engine 2-16, 2-38, 4-30 . . . . . . . . . . . . . . . . . . . . . .
Exit and Entry Lighting 2-53 . . . . . . . . . . . . . . . . . . . . . . . . . .
Express-Down Windows 2-41 . . . . . . . . . . . . . . . . . . . . . . . . .
Extended Mobility Tires 6-42 . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps 2-44, 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fabric Protection 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Control Buttons 3-2, 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature, Theft-Deterrent 2-17 . . . . . . . . . . . . . . . . . . . . . . . . .
Fiberglass Springs 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fifth Gear, Manual Transmission 2-31 . . . . . . . . . . . . . . . . . . .
Filling
A Portable Fuel Container 6
-9 . . . . . . . . . . . . . . . . . . . . . . .
Your Tank 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter, Air Cleaner 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish
Care 6
-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First Gear
Automatic Transmission 2
-29 . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission 2-30 . . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Mast Antenna 3-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flashers, Hazard Warning 5-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Flat Tire, What to Do 5-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Mats 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Capacities 6-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-6
Fob Training 2-101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Lamps 2-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreign Countries, Fuel 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fourth Gear, Manual Transmission 2-31 . . . . . . . . . . . . . . . . .
French Language Manual ii. . . . . . . . . . . . . . . . . . . . . . . . . . .
Front
Air Dam 2
-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sidemarker Lamp Bulb Replacement 6-35 . . . . . . . . . . . . .
Turn Signal Lamp Bulb Replacement 6-35 . . . . . . . . . . . . .
Fuel 6-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canada 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door, Manual Release Tab 6-7 . . . . . . . . . . . . . . . . . . . . . . .
Door Release Button 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Fuel Container 6-9 . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gage 2-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Foreign Countries 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses and Circuit Breakers 6-68 . . . . . . . . . . . . . . . . . . . . . . .
Gages
Engine Coolant Temperature 2-82 . . . . . . . . . . . . . . . . . . . .
Engine Oil Pressure 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 2-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltmeter 2-79 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAWR 4-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Positions 2-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Mobility Program 8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Vehicle Care/Appearance Materials 6-64 . . . . . . . . . . . . .
Gross
Axle Weight Rating 4
-31 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle Weight Rating 4-31 . . . . . . . . . . . . . . . . . . . . . . . . .
Guide en Fran†ais ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GVWR 4
-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogen Bulbs 6-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazard Warning Flashers 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Doors 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High/Low Beam Changer 2-46 . . . . . . . . . . . . . . . . . . . . . .
Wiring 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Head-Up Display (HUD) 2-88 . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing Impaired, Customer Assistance 8-4 . . . . . . . . . . . . . .
Heated Remote Control Mirrors 2-55 . . . . . . . . . . . . . . . . . . .
Heating 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Beam Lamps 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Highway Hypnosis 4-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hill and Mountain Roads 4-24 . . . . . . . . . . . . . . . . . . . . . . . . .
Hood
Checking Things Under 6
-9 . . . . . . . . . . . . . . . . . . . . . . . . .
Release 6-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HUD 2-88 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Clutch 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydroplaning 4-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Switch 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Transmission Lock Check 7-16 . . . . . . . . . . . . . . . . .
Inadvertent
Load Control 2
-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lockout Protection 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation, Tire Pressure 6-45 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview Mirror 2-54 . . . . . . . . . . . . . . . . .
Inspections 7-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake System 7-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Cooling System 7-18 . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust System 7-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .