Copyright © 1996 General Motors Corp. 3–5
PREVENTIVE MAINTENANCE
PREVENTIVE MAINTENANCE
Table 3–2. Transmission Fluid and Filter Change Intervals
Transmission
Application
Fluid Change
Internal Sump and
Governor Filters
External
Auxiliary Filter**
AT 500 Series
(On-Highway)
(Light-duty)
Paper Filter:
25,000 miles (40 000 km)
or 12 months*
Paper Filter in Shallow Pan (4.0 inches)
or Deep Pan (5.3 inches):
25,000 miles (40 000 km)
or 12 months*
After first 5000 miles
(8 000 km) and at 25,000 miles
(40 000 km) or 12 months*,
thereafter
(School Bus, NA
Motorhome and
One-Way Rental)
Brass Filter:
50,000 miles (80 000 km)
or 24 months*
Brass Screen Filter in Shallow Pan
(4.0 inches) or Deep Pan (5.3 inches):
50,000 miles (80 000 km) with no
time limit
AT 500 Series
(On-Highway)
(Heavy-duty)
(Models With
Retarder)
25,000 miles (40 000 km)
or 12 months*
Paper Filter in Shallow Pan (4.0 inches)
or Deep Pan (5.3 inches):
25,000 miles (40 000 km) or
12 months*
After first 5000 miles
(
8 000 km) and at normal fluid
change intervals thereafter
Brass Screen Filter in Shallow Pan
(4.0 inches) or Deep Pan (5.3 inches):
50,000 miles (80 000 km) with no
time limit
AT 500 Series
(Off-Highway)
1000 hours max or 12 months* Paper Filter in Shallow Pan (4.0 inches)
or Deep Pan (5.3 inches):
at each fluid change interval
After first 500 hours, and at
normal fluid change intervals,
thereafter
Brass Screen Filter in Shallow Pan
(4.0 inches) or Deep Pan (5.3 inches):
at each fluid change interval
* Whichever occurs first.
** An Allison high-efficiency oil filter may be used until the Change Filter light indicates it is contaminated or until it has been in use for three years,
whichever occurs first. No mileage restrictions apply.
Table 3–3. Fluid Oxidation Measurement Limits
Measurement Limit
Viscosity ±25% change from new fluid
Carbonyl absorbance + 0.3 A*/0.1 mm change from new fluid
Total acid number + 3.0 change from new fluid
Solids 2% by volume maximum
*A = Absorbance units
Refer to SIL 17-TR-83 for fluid analysis techniques and data interpretation.
Consult your local industrial yellow pages for fluid analysis firms. Use one fluid analysis firm.
Results between firms cannot be accurately compared.
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