01-04.5 LB7 Duramax PowertrainDiscussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect
Well since your an 03 gm recomendes DexIII. I do beleive it is 7 quarts. Yes you will have several say amsoil sice they are a dealer.
__________________ 2003 GMC Sierra SLT CC/SB. Loaded interior, autometer gauges, ATS E-POWER, Ported fuel fitings, PPE Boost valve, Rapid Flow intake, Plugged resenator, Straight piped with 6 inch tip, High idle, 285/75/R16 Pro comp All Terrains, Tinted windows, Step tubes, Bed rail caps with bed tubes, adding more all the time. Decked out with LEDs for the fire department. Saving for trans and a few more goodies.
I use amsoil for oil and valvoline full synthetic for the tranny and been happy with it. I picked up some milage and it keeps the tranny temp a little lower.
__________________ 08 2500 LMM Z71 Hd with a Ready lift leveling kit,Banks monster exhaust,K and N filter,max energy programmer set at stage 3 a 91Hp tune,transgo,PPE shim kit, Jr 18-9 pro comp rims sitting on 325/60 r 18's Toyo A/t's,Westin Chrome nerf bars and Plasma Glow low beams and all emblems are gone except for the Z71 and Duramax on the hood,molding gone too.
If you are just going to drain the pan, it is about 7.5. I am going to go Torque Drive on my next change- longer intervals as well as cooler running tran temp (on a little warm when towing travel trailer, but want it lower).
__________________ '05 CC/SB, AMSOIL 5w-40, KN Cold Air Intake, PPE Tuner level 1, EGR blocked, MP mod, res. plugged, lost KITTY, finished off the rest with 4" SS Magnaflow
__________________ Tom's new truck: red 08 duramax lmm , LTZ, crewcab 3500 4x4, stock for now for towing racecar trailer #10000lb's , spray in liner, has black aftermarket ranchhand cowboy bumper with cowcatcher for that sinister look , matching back bumper, added a toolbox in bed , new lights on push bar , cb chip to come later remember old age isn't for sissies !! never hollar whooaa!! http://i335.photobucket.com/albums/m...1/P9150004.jpg
allison says never and gm says every 50k on internal filter changes........
__________________ '05 CC/SB, AMSOIL 5w-40, KN Cold Air Intake, PPE Tuner level 1, EGR blocked, MP mod, res. plugged, lost KITTY, finished off the rest with 4" SS Magnaflow
I change my spin on filter every 15-20K, but I did a full flush and internal change when I bought the truck last year and have not looked back. I run Torque Drive and have not looked back. However, there ARE less expensive alternatives for your truck that will give you great full synthetic results as well. I suggest doing your own research and have a chat with your choice of DuramaxForum.com Vendors about Amsoil if you want to know what it would cost, or have any specific questions.
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chip to come later remember old age isn't for sissies !! never hollar whooaa!! 
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