What's the noise heard as soon as you open the drivers door on the 2018 suburban. Is it the fuel pump priming up?
Also whats the noise heard when loading heavy objects in the back. I heard this noise on two separate occasions, both when loading bags of mulch. Sounds as if something is filling with air but we don't have an air bag system.
The 2 free oil changes are done on the truck so ill be doing them myself, whats the recommended oil and filter. South Louisiana. Any oils good in the suburban for 15,000 miles?