GMC 2003 GMT560 T-Series, Owner'S Manual

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Part C: Recommended Fluids and
Lubricants
Fluids and lubricants identified below by name, part
number or specification may be obtained from your
dealer.
Usage Fluid/Lubricant
Engine Oil
Engine oil with the letters CI-4 or
CH-4 is best for your vehicle. The
CI-4 or CH-4 designation may
appear either alone or in
combination with other API
designations, such as API CI-4/SL.
These letters show American
Petroleum Institute levels of quality.
To determine the preferred viscosity
for your vehicle’s diesel engine, see
Engine Oil (DURAMAX™ Diesel) on
page 5-9.
Engine Coolant
50/50 mixture of clean, drinkable
water and use only
DEX-COOL
®
Coolant. See Engine
Coolant on page 5-16.
Usage Fluid/Lubricant
Hydraulic Brake
System
Delco Supreme 11 Brake Fluid or
equivalent DOT-3 brake fluid.
Windshield
Washer Solvent
GM Optikleen
®
Washer Solvent.
Clutch Bearing
Lubricant
Clutch Bearing Lubricant (GM Part
No. 12378484 or equivalent NLGI #3
consistency).
Exhaust Brake
Ball Joint Cap
Lubricant
High-Temperature Grease (GM Part
No. U.S. 1051344, in Canada
903037) or NLGI #3 consistency.
Power Steering
System
DEXRON
®
-III Automatic
Transmission Fluid.
Manual
Transmission
Synthetic Manual Transmission Fluid
(GM Part No. U.S. 12345724, in
Canada 10953510).
Automatic
Transmission
See the Allison
Transmission
®
Operator’s Manual for
correct transmission fluid.
Key Lock
Cylinders
Multi-Purpose Lubricant, Superlube
(GM Part No. U.S. 12346241, in
Canada 10953474).
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