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I'm new at this oil selection/analysis, as I have not purchased a new truck in many years where I can service and record from new. I want to take great care of my investment, as best I can: 2023 GMC Sierra 3500HD; 6.6L GAS/6 Speed Trans; 4x4; Crew Cab; Short Bed After doing some reading on the...

Hello all- My NEW 2023 GMC Sierra 3500 HD, 6.6L GAS / 6 Speed Trans, Crew Cab, 4X4... Owner's manual calls for 5W-30 DEXOS 1 - Gen 3. Manual doesn't suggest anything different for towing. I contacted M1 and they sent me the attached (see link below). When I asked what the differences were...

Hello all-- RE: My new 2023 GMC 3500HD 6.6L Gas and 6 Speed Auto... Manual states, "perform the first oil change before heavy towing." In addition, "Do not drive over 50mph and do not make starts at full throttle during the first 500 miles of trailer towing." I am going to reach 500 miles in...

What section is discussion on HD Trucks with GAS motors, Ex. 2023 GMC 3500HD 6.6L GAS?

New member here. My truck: 2003 Ford F-350, XLT, 4X2; 6.8L; 4R100 80K miles Towing travel trailer and boats (3K-8K) several times per year...distances between 50 miles and 2000 miles Preparing for a rear differential service. My rear axle tags are as follows; it is a Ford axle: 10.5"; 3.73...