Chevrolet 2001 Silverado 1500 Pickup Owner's Manual page 445

Weatherstrip Lubrication
Silicone grease on weatherstrips will make them last
longer, seal better, and not stick or squeak. Apply
silicone grease with a clean cloth. During very cold,
damp weather more frequent application may be
required. See "Recommended Fluids and Lubricants"
in the Index.
Manual Transmission Check
Check the transmission fluid level; add if needed.
See "Manual Transmission Fluid" in the Index.
Check for leaks. A fluid leak is the only reason for fluid
loss. Have the system inspected and repaired if needed.
Automatic Transmission Check
Check the transmission fluid level; add if needed.
See "Automatic Transmission Fluid" in the Index.
A fluid loss may indicate a problem. Check the system
and repair if needed.
7-20
Hydraulic Clutch System Check
Check the fluid level in the clutch reservoir. See
"Hydraulic Clutch Fluid" in the Index. A fluid loss
in this system could indicate a problem. Have the
system inspected and repaired at once.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all body door hinges, hood latch assembly,
secondary latch, pivots, spring anchor, release pawl,
tailgate hinge, tailgate linkage, tailgate handle pivot
points, latch bolt, fuel door hinge, locks and folding
seat hardware. Part D tells you what to use. More
frequent lubrication may be required when exposed to
a corrosive environment.