Best Engine Oil for GMC Sierra 2500 and 3500

Best Engine Oil for GMC Sierra 2500 and 3500

What’s the best engine oil for the GMC Sierra 2500 and 3500? These trucks are plush, awesome, have good power, and have a very good reputation and a large following. They’re commonly long running and hard working, so better to use the best 100% synthetic engine oil to help keep ’em long runnin’ so they…