You can download the 2004 Chevrolet Colorado Owners Manual here:
http://www.extendedgmwarranty.com/owners-manual/chevrolet/2004-Chevrolet-Colorado.pdf
2004 CHEVROLET TRUCKS COLORADO 3.5L 5-cyl Engine Code [6]
LUBRICANTS & FLUIDS:
Engine Oil
Grade 1......API*[1]
SAE 5W-30
Above 0 F......10W-30
All TEMPS......5W-30 [2]
Manual Transmission,4WD......GL-3 [3]
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)
Manual Transmission,2WD......GL-3 [3]
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)
Automatic Transmission,4L60-E......AF6 [4]
Low Viscosity Synthetic ATF (ATLQT)
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Differential, Rear......GL-5
All TEMPS......75W-90 [5]
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SAE 80W-90 Synthetic Gear Lube (AGLQT)
Differential, Front......GL-5
All TEMPS......75W-90 [5]
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SAE 80W-90 Synthetic Gear Lube (AGLQT)
Transfer Case,Isuzu T150......GLS [6]
Synthetic Synchromesh Transmission Fluid (5W-30) (MTFQT)
Fluids
Clutch Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
Power Steering Fluid......PS
Power Steering Fluid (PSFCN)
Clutch Fluid......
Brake Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
[1] Oil must be formulated to meet GM standard GM6094M.
[2] SAE 5W-30 is preferred.
[3] Use GM part no. 89021806 or equivalent.
[4] This specification has been updated from Dexron II or III to Dexron VI per a Technical Service Bulletin from the manufacturer
[5] Synthetic lubricant, GM part no. 12378261, or equivalent product formulated to meet GM specification 9986115.
[6] GM part no. 12345349 or equivalent.
CAPACITIES:
Engine, with filter..........6.1 quarts [1]
Cooling System, Initial Fill..........10.6 quarts
Automatic Transmission, 4L60-E Initial Fill..........5 quarts
Automatic Transmission, Total Fill
4 speed 4L60-E..........11.3 quarts
Manual Transmission, 2WD..........5.1 pints
Manual Transmission, 4WD..........5.3 pints
Differential, Front..........3.2 pints
Differential, Rear..........3.4 pints [2]
Transfer Case, Isuzu T150..........2.8 pints