GMC 2006 Sierra - Manual (Page 445)

How to Add Automatic
Transmission Fluid
Refer to the Maintenance Schedule to determine what
kind of transmission fluid to use. See Recommended
Fluids and Lubricants (Gasoline Engine) on page 6-14.
Add fluid only after checking the transmission fluid
while it is hot. A cold check is used only as a reference.
If the fluid level is low, add only enough of the proper
fluid to bring the level up to the HOT area for a hot
check. It does not take much fluid, generally less than
one pint (0.5 L). Do not overfill.
Notice: Use of the incorrect automatic transmission
fluid may damage your vehicle, and the damages
may not be covered by your warranty. Always use the
automatic transmission fluid listed in Recommended
Fluids and Lubricants (Gasoline Engine) on
page 6-14.
• After adding fluid, recheck the fluid level as described
under “How to Check Automatic Transmission Fluid,”
earlier in this section.
• When the correct fluid level is obtained, push the
dipstick back in all the way.
Manual Transmission Fluid
When to Check Manual
Transmission Fluid
A good time to have your manual transmission fluid
checked is when the engine oil is changed. See
Additional Required Services (Gasoline Engine)
on page 6-7 to find out when to change your
transmission fluid.
How to Check Manual
Transmission Fluid
Because this operation can be a little difficult, you may
choose to have this done at the 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 engine part or
exhaust system parts, starting a fire. Too little fluid
could cause the transmission to overheat. Be sure
to get an accurate reading if you check your
transmission fluid.
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