I have a 04 you on lots of sludge in the oil pan still no oil pressure no metal shavings in the pan
Replace the oil pump,and clean the strainer tube,may help.
As TST said plus service the crankcase ventilation system. A plugged crankcase ventilation system will cause excessive sludging. As well as infrequent oil changes. HTH. -Jim
Search GMC Yukon XL Questions
GMC Yukon XL Experts