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Just want to know how many of yall are using Mobil 1 Truck & Suv, in what size engine and why did u choose it? Thanks.............

I just recently bought a 2005 GMC Sierra 2500HD 6.0 Ext Cab 4x4 and was wondering how many other 6.0 engines out there are using Mobil Truck & Suv 5w40? I made my first oil change at 1700 miles, and used Mobil 5w30. Ive searched these forums and there seems to be a consensus that the LS1 based...