LUBRICANTS & FLUIDS
Engine Oil
Grade 1......API*
SAE 0W-30 Synthetic Signature Series Oil
SAE 5W-30 Synthetic Motor Oil
SAE 5W-30 XL Synthetic Motor Oil
Above 0°F......10W-30
Above 39°F......30
All Temps......5W-30[1]
Manual Transmission,5-SPD Sect Case.....GLS[2]
AMSOIL Synthetic Synchromesh Transmission Fluid
Manual Transmission,NV4500.....GLS[3]
Synthetic Manual Transmission and Transaxle Gear Lube 75W-90
Automatic Transmission.....AF6
Synthetic Automatic Transmission Fluid
Standard Differential, Front .....GL-5[4][5]
All Temps......80W-90
SAE 80W-90 Synthetic Gear Lube
Severe Gear 75W-90
SAE 75W-90 Synthetic Gear Lube
Controlled Slip Differential, Rear .....GL-5*[5]
All Temps......80W-90
SAE 80W-90 Synthetic Gear Lube
Severe Gear 75W-90
Standard Differential, Rear .....GL-5[5]
All Temps......80W-90
SAE 80W-90 Synthetic Gear Lube
Severe Gear 75W-90
SAE 75W-90 Synthetic Gear Lube
Transfer Case,NP241, NP243.....GLS[6]
Synthetic Automatic Transmission Fluid
Torque-Drive™ Synthetic Automatic Transmission Fluid (ATD)
Transfer Case,BW4470.....GLS[6]
Synthetic Automatic Transmission Fluid
Torque-Drive™ Synthetic Automatic Transmission Fluid (ATD)
Transfer Case,BW1370, BW4401.....GLS[6]
Synthetic Automatic Transmission Fluid
Torque-Drive™ Synthetic Automatic Transmission Fluid (ATD)
Fluids
Power Steering Fluid.....PS
Brake Fluid.....HB
Series 500 High Performance DOT 3 Brake Fluid
Clutch Fluid.....HB
Series 500 High Performance DOT 3 Brake Fluid
1. SAE 5W-30 is preferred.
2. GLS is a special gear lube, GM part no. 12345349 or 1052931. (5-SPD).
3. Synthetic gear oil, GM part no. 12346190 or equivalent.
4. In cold climates when excessive shift effort is required to shift into 4WD 75W-90 Synthetic GM part no. 12345836 may be used in front differential.
5. 1988-99 models
Do not use synthetic lubricant in axles using RTV sealant. Synthetic lubricant will chemically atack RTV sealant. American Axle has only approved the use of Synthetic
Lubricant 75W-90 GM part no. 12378261, as follows:
a. All 8.6" rear axles are compatible.
b. All 9.5" rear axles built before mid-February 1998 (RTV sealant used to seal cover pan) are not compatible
c. All 9.5" rear axles built after mid-February 1998 (equipped W/ cover pan & gasket) are compatible.
d. All 10.5" rear axles built prior to March 3, 1999 are compatible if axle shafthub RTV sealer is replaced W/ GM gasket part no. 327739.
6. Gm recommends part no (USA 88861800) Canada (88861801) or equivalant for manual transmission, transfer case applications.
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