NMTRUCKER

I have a 2023 GMC SIERRA SLT with the LZ0 and changed the oil at 2900 miles and had an oil analysis done. The AC DELCO 0w-20 DEXOS D oil was blackish in appearance but the oil analysis showed an oil soot level of 0.1%, a fuel dilution level of 0.4%, and a Total Base Number of 5.45. All of these parameters are well within normal limits. The DEXOS D rated oils have more detergents to keep the soot suspended in the oil as well as having low ash content to protect the DPF.