Approved Allison Transmission Lubricants
Lubricant Type
*
Temperature: °F (°C)
All Allison Transmissions
Castrol TranSynd
™
(synthetic)
Above –22 (–30)
Dexron® III
Above –13 (–25)
*
Lubricants listed in order of preference. Do not mix types of oil.
Table 4, Approved Allison Transmission Lubricants
NOTICE
Do not fill above the COLD RUN band if the trans-
mission fluid is below normal operating tempera-
ture. As fluid temperature increases, so does the
fluid level. Filling above the COLD RUN band
when the transmission is below normal operating
temperature may result in an overfilled transmis-
sion, which causes fluid foaming and aeration.
Fluid foaming and aeration cause transmission
overheating and erratic shifting.
NOTE: Perform a hot check at the first opportu-
nity after the normal operating temperature, 160
to 200°F (71 to 93°C) has been reached.
Hot Check
1.
Park the vehicle on a flat, level surface. Apply
the parking brakes and chock the rear tires.
2.
Shift the transmission to NEUTRAL.
3.
Operate the engine at idle (500 to 800 rpm) until
normal operating temperature is reached. Check
that the sump temperature is 160 to 200°F (71 to
93°C). Check that the converter-out temperature
is 180 to 220°F (82 to 104°C).
4.
With the engine idling, remove the dipstick from
the tube and wipe it clean.
5.
Insert the dipstick into the tube, then remove it.
6.
Check the fluid level reading and repeat the
check procedure to verify the reading. Safe oper-
ating level is within the HOT RUN band on the
dipstick. The HOT RUN band is between the
HOT FULL and HOT ADD marks.
If the fluid level is not within the HOT RUN band,
add or drain fluid as needed to bring the fluid
level within the HOT RUN band. See
. For
approved Allison transmission lubricants, see
Mercedes-Benz
1.
Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2.
Check the oil level in the transmission as follows.
2.1
Clean the area around the fill plug, then
remove the plug from the side of the
case.
2.2
Using your finger or a bent pipe cleaner,
see if the oil is level with the lower edge
of the fill opening. See
3.
If needed, fill the transmission with oil until level
with the lower edge of the fill opening. For ap-
proved lubricants, see
Mercedes-Benz Approved Transmission Lubricants
Lubricant Type
*
Temperature:
°F (°C)
SAE
Viscosity
Synthetic transmission
lubricant meeting Eaton PS-
386 lubricant specification
All
—
*
Do not mix types of oil.
Table 5, Mercedes-Benz Approved Transmission
Lubricants
IMPORTANT: If switching from a petroleum-
based lubricant to a synthetic, all areas of each
affected component must be thoroughly drained.
Switching to a synthetic lubricant, when a
petroleum-based lubricant has been used for
50,000 miles (80 000 km) or longer may affect
transmission performance. Monitor all seal
areas for the first 10,000 miles (16 000 km)
12/01/97
A
B
f270002a
A. Cold Run Band
B. Hot Run Band
Fig. 2, Dipstick Markings, Allison
Transmission
26
Business Class M2 Maintenance Manual, March 2016
26/3
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