Did you check your owners manual? Spec is a synthetic 75w-140 + posi additive.
From Amsoils web site
Engine Oil
Grade 1......API*
Signature Series 0W-30 100% Synthetic Motor Oil (SSOQT)
SAE 5W-30 Synthetic Motor Oil (ASLQT)
XL 5W-30 Synthetic Motor Oil (XLFQT)
All TEMPS......5W-30
Manual Transmission,M50D-R4......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Manual Transmission,M5OD-R4......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,5R55E......MA5
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Automatic Transmission,5R55W......MA5
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Differential, Front......GL-5
All TEMPS......80W-90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Limited Slip Differential, Rear......GL-5*
All TEMPS......75W-140 [1] [2]
SEVERE GEAR 75W-140 Synthetic EP Lubricant (SVOQT)
80W-140 Synthetic Long Life Gear Lube (FGO05)
Standard Differential, Rear......GL-5
All TEMPS......75W-140 [2]
SEVERE GEAR 75W-140 Synthetic EP Lubricant (SVOQT)
80W-140 Synthetic Long Life Gear Lube (FGO05)
Transfer Case,......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Fluids
Power Steering Fluid......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Power Steering Fluid......MA
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Brake Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
Clutch Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
[1] Limited Slip Identification: Letter & number
on plate on door lock pillar. (Models W/ Traction-Lok Rear
Axle Add 4 oz of friction modifier part no. C8AZ-19B546A
(EST-M2C118-A) or equivalent)
[2] Synthetic oil is required.
FILTERS:
Oil Filter Absolute Efficiency Oil Filter (EAO11)
Oil Filter WIX 51372 Oil Filter
Air Filter Absolute Efficiency Air Filter (EAA484)
Air Filter Absolute Efficiency Air Filter (EAA122)
Air Filter WIX 46253 Air Filter
Air Filter WIX 42484 Air Filter
Fuel Filter WIX 33424 Fuel Filter
Fuel Filter WIX 33243 Fuel Filter
Transmission Filter
Transmission Filter WIX 58841 Auto Tran Filter [1]
Transmission Filter WIX 58840 Auto Tran Filter [2]
[1] 4WD
[2] 2WD
NGK PLUGS AND WIRESETS:
GPSERIES PLUG TR55GP NGK3403 [1]
IXIRIDIUM PLUG TR55IX NGK7164 [1]
PREMIUMIRIDIUM PLUG ITR5F13 ^ [1]
PREMIUMPLATINUM PLUG PTR5F-11 * [1]
VPOWER PLUG TR55 NGK3951 [1]
WIRESET WIRESET RC-FDZ080
WIRESET WIRESET RC-FDZ091
[1] Plugs - SOHC
WIPER BLADES:
Blade Class Driver Passenger Rear
ExactFit T181
ExactFit T221 T221
ExactFit T181 T141
ExactFit T161
NeoForm T16180
NeoForm T16220 T16220
NeoForm T16180 T16140
NeoForm T16160
Winter T37180
Winter T37225 T37225
Winter T37180 T37160
Winter T37131
CHASSIS LUBRICATION:
0 Fittings, 0 Plugs
CAPACITIES:
Engine, with filter..........5 quarts [1]
Cooling System, Initial Fill..........16.3 quarts
AMSOIL Antifreeze and Engine Coolant
Cooling System, With RR HEAT Initial Fill..........18.2 quarts
AMSOIL Antifreeze and Engine Coolant
Automatic Transmission, 5R55W Initial Fill..........Not Specified
Automatic Transmission, 5R55E Initial Fill..........Not Specified
Automatic Transmission, Total Fill
5 speed 5R55E..........13.5 quarts
5 speed 5R55W..........12.4 quarts
Manual Transmission, M50D-R4..........5.1 pints
Manual Transmission, M5OD-R4..........5.1 pints
Differential, Front..........3.6 pints [2]
Differential, Conventional Rear..........3.6 pints [3]
Differential, Traction-Lok Rear..........3.2 pints [3]
Transfer Case, ..........3 pints
[1] After refill check oil level.
[2] Fill no higher than 9.5 mm or 3/8 inch below fill plug.
[3] Fill to no more than 1/4 to 9/16 inch below fill plug hole.
TORQUES:
Oil Drain Plug.....19 ft/lbs
Manual Transmission
Fill Plug 36 ft/lbs
Drain Plug 36 ft/lbs
Transfer Case BW 4411
Fill Plug 11 ft/lbs
Drain Plug 11 ft/lbs
