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Hope nobody minds, but I'm going to start up a Quick Reference Guide for common parts/fluids/bulbs for the T1 HD trucks. I'll try to keep it updated if anything changes. If a mod wants to sticky it, I'm down for that too. Owners Manuals Chevrolet: https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/2020/chevrolet/silverado-2500-3500/2020-chevrolet-silverado-owners-manual.pdf GMC: https://my.gmc.com/content/dam/gmownercenter/gmna/dynamic/manuals/2020/gmc/sierra-2500-3500/2020-gmc-sierra-owners-manual.pdf Diesel Supplement: https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/2020/chevrolet/multimodel/2020-6.6-duramax-diesel-supplement.pdf Oil Changes 6.6 gas L8T (VIN code "7") Capacity: 8 Quarts AC Delco Oil Filter: PF63E / 19383806 Drain Plug Size: 12X1.75X18.15 6.6 Diesel L5P (VIN code "Y") Capacity: 10 Quarts AC Delco Oil Filter: PF26 / 89017527 Drain Plug Size: 12X1.75X18.15 Engine Air Filters 6.6 Gas: A3244C / 84121219 6.6 Diesel: A3248C / 84554703 Engine Fuel Filter 6.6 Diesel L5P: TP1015 / 23304096 Interior Filters Passenger Compartment Air Filter: CF185 / 13508023 Wiper Blades Drivers & Passenger Sides: 23387857 Spark Plugs 6.6 Gas L8T: 41-114 / 12622441 Glow Plugs 6.6 Diesel L5P: 68G / 12690238 Fuel Tank Sizes 6.6 Gas L8T, All Box/Cab Configurations: 36 Gallons 6.6 Diesel L5P Double Cab Long Box/Crew Cab Standard and Long Box Configurations: 36 Gallons. 6.6 Diesel L5P Double Cab Standard Box Configuration: 29 Gallons. 6.6 Diesel L5P Regular Cab Long Box Configuration: 28 Gallons. Diesel Exhaust Fluid Tank Capacity: 7 gallons Automatic Transmission Fluid 6L90 6 Speed MYD (Gas engine): DEXRON-VI Automatic Transmission Fluid 10L1000 10 Speed MGM/MGU (Diesel engine): DEXRON ULV Automatic Transmission Fluid. Transmission Capacities (Approximate): 6L90 6 Speed MYD (Gas engine) Pan Drop: 6.0 quarts Overhaul: 10.5 quarts Complete System: 12.4 quarts 10L1000 10 Speed MGM/MGU (Diesel engine) Overhual: 20.6 quarts Complete System: 22.08 quarts Transfer Case Fluid Electronic Shift Non-Autotrac MP 1625/1626–NQF: Dexron VI Electronic Shift Autotrac MP 3025–NQH: Dexron VI Transfer Case Fluid Capacities Electronic Shift Non-Autotrac MP 1625/1626–NQF: 2.4 Quarts Electronic Shift Autotrac MP 3025–NQH: 1.6 Quarts Brake System Hydraulic Brake System (Vehicles with DOT 3 brake fluid): DOT 3 Hydraulic Brake Fluid Hydraulic Brake System (Vehicles with DOT 4 brake fluid): DOT 4 Hydraulic Brake Fluid Wheel Lug Nut Torque All Models: 140 lb-ft / 190 N-m Front Axle 9.25" Axle Lubricant: 75w85 Synthetic High Efficiency Lubricant, 10-4091 / 19300457 Capacity: 1.9 Quarts Rear Axle 11.5" Axle Lubricant:75w90 Synthetic Lubricant, 10-4016 / 88900401 Capacity: 3.17 Quarts Rear Axle 12.0" Axle Lubricant:75w90 Synthetic Lubricant, 10-4016 / 88900401 Capacity: 3.17 Quarts

Has anyone else used the AMSOIL OE ATF over the Signature Series in their 8 Speed? Any issues? Looking to get a flush done soon and want to make sure the fluid is compatible. I'd rather not shell out $300 CAD for the signature series when the OE will do. Thanks.

I had purchased AMSOIL Signature Series ATF for my 18 Silverado - 6 speed. After having it sit for a while and never getting to a transmission flush on my own time, I called a local, honest, reputable transmission shop near me that has always treated my dad very well. They’re a no-bull, honest shop, and the owner is down to earth and knowledgeable regarding transmissions, as he should be. I informed him I had AMSOIL and wanted it switched with that, and he advised that for the 6L80E, it wasn’t a great idea. He has nothing against a better fluid, but he advised that AMSOIL doesn’t treat the electronics nicely, and it’s a common issue. I’m an AMSOIL guy, and do want him to use the AMSOIL fluid, but has anyone else heard of this or advise to simply use DEXRON VI and NOT AMSOIL?